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White Sox Place Martin Perez On IL Due To Shoulder Strain

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The White Sox have placed veteran lefty Martin Perez on the 15-day injured list due to a shoulder strain, the team announced. The injury ends Perez’s season. Left-handed reliever Cam Booser is up from Triple-A Charlotte to take his spot on the roster.

Perez, 34, exited his last start early and clearly knew something was amiss. He delivered a pitch to Orioles second baseman Jackson Holliday and quickly called for time before motioning for assistance from the training staff (video link). He looked directly at his shoulder, shook his head in frustration while handing the ball to manager Will Venable, and immediately departed with trainer James Kruk.

It’s been a frustrating year for the well-traveled Perez. He signed a one-year, $5MM deal with Chicago over the winter and has pitched quite well when healthy — but that’s an unusually notable caveat with Perez in 2025. The typically durable southpaw suffered a flexor strain during his fourth start of the season and was out for nearly four months. He returned in mid-August only to incur this shoulder injury in just his seventh start back on the bump.

Perez’s 2025 season will draw to a close with a solid 3.54 ERA — but in a relatively small sample of just 56 innings. It’s the fewest innings Perez has pitched in a season since 2014, when he underwent Tommy John surgery. He’s pitched in at least 26 games every full season since 2019 and also made a full slate of 12 starts in the shortened 2020 campaign. He’s been bumped to the bullpen amid a rough patch a couple of times — both with the ’21 Red Sox and the ’23 Rangers — but outside of a three-week absence due to a 2024 groin strain and a quick placement on the Covid list in 2021, this year’s pair of IL placements are Perez’s first since 2018.

The White Sox haven’t specified how long Perez will be sidelined, but ending the season with a shoulder strain after missing four months due to a flexor strain isn’t how any pitcher wants to head back into free agency. There’s a $10MM mutual option on Perez’s contract, but even if he were healthy, it’s been more than a decade since both sides of a mutual option were exercised in MLB. The Sox will pay Perez a $1.5MM buyout and he’ll become a free agent in November. The type of contract he signs will hinge heavily on the severity of his shoulder strain, which to this point remains an unknown.

Poll: Luis Robert Jr.’s Option

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While they won’t be breaking the major league record for losses this year like they did in 2024, it’s been another tough year for the White Sox. They’ve lost 95 games and could lose 100 games for the third year in a row. Emerging young players like Kyle Teel and Colson Montgomery have made this season a little easier for fans on the south side of Chicago to stomach, but there’s still little reason to expect the team to contend in 2026.

One of the most important offseason decisions for the White Sox has been whether to exercise a $20MM option on center fielder Luis Robert Jr. or pay him a $2MM buyout, though it seems they’ve generally already made up their mind. As soon as the Sox opted not to trade him at the deadline, it seemed likely Robert would be back in 2026 as opposed to bought out for no return. General manager Chris Getz has suggested as much on multiple occasions, and just this morning he told reporters that he expects Robert to be a part of the club next season (link via Vinnie Duber of the Chicago Sun-Times). The question, then, is less about what they will do and whether or not they’re right to do it.

With Robert all but confirmed to be done for the 2025 campaign due to a hamstring strain, his numbers appear locked in. After slashing .224/.278/.379 (84 wRC+) with 14 homers in 100 games last year, Robert produced a nearly identical .223/.297/.364 line (82 wRC+) and slugged 14 homers in 110 games in 2025. Between that apparent lack of progress and Robert’s continued injury woes, it might seem difficult to understand why the White Sox would stick with him rather than simply viewing him as a sunk cost.

Despite his eerily similar (and disappointing) numbers, however, digging a little deeper into Robert’s 2025 numbers actually reveals reason for optimism. He stole ten more bases this year than last, going 33-for-41 as opposed to 2024’s 23-for-29. Robert’s defense is also showing signs of a rebound, as he jumped from a Fielding Run Value of 0 in 2024 to a +7 figure this year, good for top 10 among center fielders in baseball this year.

More encouraging than either of those changes are the differences in his approach at the plate. While Robert’s overall slash line doesn’t look terribly different, he cut his strikeout rate from 33.2% in ’24 to a more manageable 26% in ’25. His 9.8% walk rate isn’t just an improvement over last year’s 6.6% mark — it’s a new career-high. Robert also did his best work this summer, rebounding from a slow start to hit .274/.335/.458 with nine homers, a 19.7% strikeout rate and a 7.6% walk rate over his final 198 plate appearances. That was 17% better than average, per wRC+.

As shown by Statcast, Robert’s bat speed dropped in 2024, but he’s rebounded to elite levels in 2025, ranking in the 92nd percentile of big leaguers. That could suggest there’s still some untapped power upside, but even if his days of crushing baseballs on a 30 to 40 homer pace are behind him, the combination of improved discipline, baserunning, and defense leave him in a solid position to be a three-to-four win player in the future if he can just stay healthy — though that is a colossal “if.”

It’s arguable that it’s worth an $18MM roll of the dice, particularly considering the fact that Cody Bellinger signed with the Cubs on a one-year, $17.5MM contract during the 2022-23 offseason after back-to-back down seasons with the Dodgers. Like Robert, Bellinger was coming off injury-marred seasons where he didn’t look like himself at the plate but had shown some signs of improvement in his final year in Los Angeles. Bellinger, of course, rewarded the north siders for their gamble with an All-Star campaign in 2023 and has posted a 123 wRC+ with 10.9 fWAR over the past three seasons.

On the other hand, locking Robert in for another year comes with glaringly obvious risk. With the White Sox unlikely to contend in 2026, on-field production will only benefit the team if it can then be converted into trade capital. The White Sox have had a lot of difficulty getting what they perceive to be fair value for Robert over the years, and even if he has a big first half in 2026, teams might be scared away by his uncertain history.

Furthermore, Robert’s 110 games played in 2025 are actually the second-most of his entire career. He’s never played even 150 games in a season. One first-half injury could leave Robert with little trade value next year, and force the White Sox into another situation a lot like the one they find themselves in this year as they stare down another $20MM option for the 2027 campaign.

What do MLBTR readers think the White Sox should be doing about Robert? Should they pick up his option and bet on better days in the future, or would they be better off sending him on his way and using that $18MM in savings elsewhere? Have your say in the poll below:

White Sox Release Dan Altavilla

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TODAY: The Sox announced that Altavilla has cleared waivers and been released.

SEPTEMBER 10: The White Sox announced today that right-hander Sean Burke has been recalled from Triple-A Charlotte. In a corresponding move, fellow righty Dan Altavilla has been designated for assignment.

It’s a bit of a rude belated birthday present for Altavilla, who just turned 33 on Monday. He signed a minor league deal with the Sox in the offseason. He opted out of that deal, re-signed and then opted out again, but was eventually put on the major league roster at the end of May.

His numbers on the season look good until you check under the hood. He has thrown 29 innings with a 2.48 earned run average. However, his 17.5% strikeout rate and 12.5% walk rate are both subpar figures. His 51.3% ground ball rate is pretty good but he has largely benefitted from a .197 batting average on balls in play and 89.5% strand rate. His 5.45 FIP and 4.78 SIERA suggest that good luck has kept his ERA down about two to three runs relative to where it should be.

For the Sox, they have little reason to wait for regression to kick in. As mentioned, Altavilla is now 33 years old. He can technically be retained for 2026 via arbitration but the Sox weren’t planning on doing that. For a rebuilding club playing out the string on another losing season, it makes more sense to give innings to younger guys who are hopefully developing into future contributors. Since Altavilla is out of options, he’s been bumped off the 40-man entirely.

With the trade deadline having passed, he’ll have to be placed on waivers. He won’t have too much appeal, given his underlying numbers. He also won’t be postseason eligible for any claiming club, since it’s now beyond the September 1st deadline. Though it is possible some team which has recently suffered a number of injuries needs a healthy and available arm for the short term.

If Altavilla clears waivers, he will have the right to reject an outright assignment and elect free agency. There won’t be a lot of opportunities at this stage of the calendar, so perhaps he would decide to report to Triple-A Charlotte, or he could just go into offseason mode a few weeks early.

Photo courtesy of Patrick Gorski, Imagn Images

MLBTR Podcast: Talking Mariners With Jerry Dipoto

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The latest episode of the MLB Trade Rumors Podcast is now live on Spotify, Apple Podcasts, and wherever you get your podcasts! Make sure you subscribe as well! You can also use the player at this link to listen, if you don’t use Spotify or Apple for podcasts.

This week, host Darragh McDonald is joined by Mariners president of baseball operations Jerry Dipoto to discuss…

  • Seattle’s lack of spending on free agent position players (2:30)
  • The unique challenges of getting players to want to come to Seattle (4:40)
  • The club’s interest in re-signing Josh Naylor (8:15)
  • Do optics matter when making a move such as bringing back Eugenio Suárez or Jorge Polanco? (9:20)
  • The club’s ability to add talent at the deadline (13:25)
  • Does the expanded playoff field make it harder to trade prospects for major league talent? (16:30)

Plus, Tim Dierkes of MLB Trade Rumors joins the show to discuss…

And we answer your questions, including…

Check out our past episodes!

The podcast intro and outro song “So Long” is provided courtesy of the band Showoff.  Check out their Facebook page here!

Photo courtesy of Mark J. Rebilas, Imagn Images

Luis Robert Jr. “Running Out Of Time” To Return In 2025

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The White Sox haven’t officially declared center fielder Luis Robert Jr. out for the remainder of the season, but it seems that a return to the field is in doubt. Manager Will Venable told reporters (including James Fegan of Sox Machine) that Robert is “probably running out of time” to return to the field before the end of the season, as the early days of his recovery process haven’t gone well enough to create much optimism about a quick return to action.

Robert, 28, suffered a grade 2 hamstring strain in late August and has been sidelined ever since. The mercurial center fielder is just two years removed from an All-Star appearance amid a dominant five-win season, but his career has been marred with injuries and inconsistency. After playing in just 166 total games between the 2021 and ’22 campaigns, Robert has slumped badly in each of the last two seasons while battling more injuries.

In 210 games since the start of 2024, he’s hit just .223/.288/.372 with a wRC+ of 83. While he’s stolen an impressive 56 bases in that time, including 33 this year, he’s struck out at a 29.6% clip without offering quite enough power or patience at the plate to justify those high strikeout rates. While he once earned a Gold Glove award for his excellent defense in center field, that aspect of his game has regressed considerably in recent years as well. He was worth just +1 OAA last year, and while that figure has rebounded to +7 in 2025 he’s been worth +0 DRS this year after posting a +1 the year prior.

Between Robert’s injuries, lower power production, lesser defense, and high strikeout rates, his value on the market has plummeted over the past two years. While the White Sox have resisted trading him even amid their rebuild as they’ve refused to part with him for less than what they view as his fair market value, other teams have begun to view Robert as a player on an underwater contract due to his flaws and inconsistency. When Robert remained in Chicago following this year’s trade deadline, many assumed that would mean he’d depart the White Sox without the club recouping anything at all for him, seeing as this is the final guaranteed year of his contract.

That may not prove to be the case, however, as the White Sox maintain that they intend to pick up his $20MM club option for the 2026 season. That’s not an entirely unreasonable decision given Robert’s past successes and his .293/.349/.459 slash line since the start of July, but that sample makes up just 37 games and his latest injury only serves as a reminder of how unreliable his presence in the lineup has been for Chicago in recent years. Chicago will presumably be open to moving Robert once again this offseason, assuming they do pick up his option but, unless they have a change of heart about their strategy when shopping him or the franchise finds a way to compete next year, it seems likely that they’ll enter the 2026 season banking on a big first half from Robert in order to maximize his trade value at next year’s trade deadline.

White Sox Outright Bryse Wilson

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The White Sox have outrighted right-hander Bryse Wilson to Triple-A Charlotte, according to a report from James Fegan of Sox Machine earlier today. Wilson was designated for assignment earlier this week and evidently cleared waivers in the following days.

Wilson, 27, signed on with Chicago on a major league deal this past winter when he hit free agency after being outrighted off of the Brewers’ 40-man roster. A former top-100 prospect who had bounced between Atlanta, Pittsburgh, and Milwaukee and had significant success as a pure reliever with the Brewers back in 2023, it was understandable for the Sox to jump at the chance to bring him in on a one-year, $1.05MM deal this winter. The White Sox did not return Wilson to the full-time relief role he had previously found success in, however, and instead used him as a swing man.

It was not a decision that went over especially well. Wilson immediately struggled after giving up his first run of the year during a three-inning outing on April 4, and went on to post a 7.33 ERA across his next 43 innings before being designated for assignment and outrighted off the club’s roster back in June. While he was briefly brought back to the majors after Aaron Civale was claimed off waivers by the Cubs, his two scoreless innings of work evidently weren’t enough to wash away his deep struggles from earlier in the season and he was designated for assignment once again shortly thereafter.

While Wilson certainly had the opportunity to elect free agency rather than stick around the organization, it’s worth noting that he would’ve forfeited the remainder of his 2025 salary by doing so due to having less than five years of MLB service time. Wilson could be retained via arbitration if added back to the 40-man roster before the end of the season, but the most likely outcome is that he’ll simply head back into free agency this winter. After posting an ugly 6.65 ERA with the White Sox this year, it seems likely that Wilson will be limited to minor league deals.

Perhaps Wilson’s next season could be a more fruitful one if his next club opts to keep him in a pure relief role. Of the 35 earned runs Wilson has allowed with Chicago this year, 27 of them were in outings where he pitched more than two innings. That works out to a 7.36 ERA allowed in outings lasting longer than two frames, even worse than his season-long numbers. As previously mentioned, Wilson’s best season being with the Brewers in 2023, for whom he never threw more than 53 pitches in an outing. By contrast, Wilson threw more pitches than that in eight of his 20 appearances with the White Sox this year.

Whatever lies ahead for Wilson, he’ll be a non-roster depth pitcher for the White Sox in the short-term. Chicago currently has Tyler Alexander and Tyler Gilbert pitching in long relief roles, with arms like Jonathan Cannon and Sean Burke on the 40-man roster as potential options to come up and help out if needed. That leaves Wilson fairly buried on the depth chart, though it’s possible the club will keep Cannon and Burke in the minors through the end of the season for development purposes.

White Sox Select Dominic Fletcher

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The White Sox have selected the contract of outfielder Dominic Fletcher from Triple-A Charlotte and reinstated righty Dan Altavilla from the 15-day injured list, per a club announcement. Right-hander Jonathan Cannon and first baseman Tim Elko were optioned to Charlotte in a pair of corresponding transactions.

Fletcher, 28, was acquired from the D-backs in the 2023-24 offseason trade that sent pitching prospect Cristian Mena to Arizona. It hasn’t worked out particularly well for either team. Fletcher hit only .206/.252/.256 in 241 plate appearances with Chicago last year — a far cry from his strong .301/.350/.441 showing in 102 plate appearances during the 2023 season. The Sox designated him for assignment in spring training and passed him through waivers.

Fletcher has spent the entire 2025 season thus far in Triple-A, where he’s batted .260/.317/.453 with 17 home runs, 19 doubles, four triples and seven steals (in 11 attempts). He’s walked at just a 6.5% clip but also has a lower-than-average 19.5% strikeout rate.

Altavilla missed more than a month due to a lat strain but will return for the final few weeks of the season. He signed a big league deal with the ChiSox midseason after briefly opting out of a minor league deal with the club. In 26 2/3 innings, the 32-year-old righty (33 on Sunday) has posted a tidy 2.36 earned run average but with far less encouraging rate stats. He’s fanned only 15.5% of his opponents against a bloated 12.7% walk rate (leading to a 5.84 FIP and 5.08 SIERA).

White Sox Designate Bryse Wilson For Assignment

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The White Sox announced that right-hander Jonathan Cannon and left-hander Tyler Gilbert have been recalled from Triple-A Charlotte. Left-hander Bryan Hudson has been placed on the 15-day injured list due to a lower back strain and righty Bryse Wilson has been designated for assignment as the corresponding moves.

Wilson, 27, signed with the Sox this winter. He was outrighted by the Brewers and elected free agency, which led to a one-year deal with the Sox worth $1.05MM. He worked in a swing role for the first few months of the season but didn’t have great results, so he was passed through waivers in June. Since he has less than five years of service time, he would have had to forfeit his remaining salary commitments in electing free agency again, so he accepted the assignment.

The Sox recently added him back to the roster to replace Aaron Civale, who was lost off waivers to the Cubs. Wilson made one more appearance for the Sox in recent days but is now bumped off the roster yet again.

On the whole, Wilson has a 6.65 earned run average in the majors this year. His 12.5% strikeout rate is well below league average and his own previous rate from earlier in his career. His minor league work has been decent. He has thrown 39 2/3 innings for the Knights with a 3.86 ERA, 22.2% strikeout rate, 4.9% walk rate and 56.1% ground ball rate.

He has come somewhat close to that level of performance in the majors before. From 2022 to 2024, he logged 297 innings in the big leagues with a 4.24 ERA, 17.5% strikeout rate, 6.7% walk rate and 40% ground ball rate.

Though his minor league numbers have been decent this year, he is out of options, which could make it hard for clubs to claim him. If he goes unclaimed on waivers again, he will likely accept a second time, in order to continue collecting what remains of this year’s salary. He would be eligible to elect free agency at season’s end if he’s not on the 40-man.

Photo courtesy of Patrick Gorski, Imagn Images

White Sox Claim Ben Cowles

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The White Sox announced Wednesday that they’ve claimed infielder Ben Cowles off waivers from the Cubs. He’s been optioned to Triple-A Charlotte. They already had multiple 40-man roster vacancies, so no corresponding transactions were needed. The White Sox’ 40-man roster is now up to 39 players.

Cowles, 25, has a good minor league track record overall but is having a down year. Drafted by the Yankees back in 2021, he went on to produce a combined .268/.365/.426 batting line across various minor league levels from 2021 to 2024. That production translated to a 124 wRC+, indicating he was 24% better than league average at the plate. His 25.9% strikeout rate was a bit high but he drew walks at an 11.5% pace. He also provided double-digit steals annually in the latter three of those years while bouncing between shortstop, third base and second base, plus two thirds of an inning in left field.

The Cubs acquired him in July 2024, one of two players they got when sending Mark Leiter Jr. to the Bronx. The Cubs added him to their 40-man roster in November to keep him out of the Rule 5 draft. But as mentioned, his results haven’t been great this year. He has stepped to the plate 462 times at the Triple-A level. His 28.6% strikeout rate and 7.1% walk rate are subpar, both compared to league average and his previous production. His .238/.304/.382 batting line translates to a 74 wRC+.

That performance got him nudged off the Cubs’ roster but he’s a sensible flier for the White Sox. He can still be optioned for two more seasons after this one, so the Sox can send him to Charlotte and see if he gets back on track. Even with his down year at the plate, he has stolen 16 bases and provided his typical defensive versatility.

The Sox are currently getting breakout seasons from Colson Montgomery and Lenyn Sosa. Montgomery should be at shortstop for the foreseeable future while Sosa will likely be at second or first. The rest of their infield mix includes some intriguing but unproven players like Miguel Vargas, Chase Meidroth, Bryan Ramos and Curtis Mead. Cowles gives the Sox another guy to put in that group as they see who separates themselves from the pack.

Photo courtesy of Cody Scanlan, Imagn Images

Cubs Claim Aaron Civale

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The Cubs have claimed right-hander Aaron Civale off waivers from the White Sox, according to a team announcement. Left-hander Tom Cosgrove was designated for assignment to make room for Civale on the 40-man roster. In addition the White Sox announced that they’ve selected the contract of right-hander Bryse Wilson to replace Civale on the club’s active and 40-man rosters.

Civale, 30, made his big league debut with Cleveland back in 2019 and posted a 3.77 ERA across 76 starts with the organization, but is now on his fifth team in the past three years as he’s changed hands between Cleveland, Tampa, Milwaukee, and now both Chicago teams. His numbers haven’t been nearly as good since he left the Guardians; since he was traded to Tampa, he’s pitched to a lackluster 4.78 ERA in 59 appearances with a 4.53 FIP and a 22.1% strikeout rate against a 7.5% walk rate. The numbers have been even less impressive this year, as he’s posted a 5.26 ERA with a 4.60 FIP in 16 starts between the Brewers and White Sox this year.

All of that might make it seem somewhat surprising that a Cubs team with designs on making it back to the postseason for the first time in a 162-game season since 2018 would have interest in his services. Despite Civale’s middling results, however, he’s still an appealing addition for Chicago thanks to the fact that he can log reliable innings for the club and help keep their top pitchers fresh ahead of the postseason. 2025 All-Star Matthew Boyd has already logged 153 1/3 innings this year despite having last thrown even 80 innings in a single season all the way back in 2019. Meanwhile, rookie Cade Horton has racked up 127 1/3 frames between Triple-A and the majors despite having never even thrown 90 innings in a season before.

Those heavy workloads could come with consequences by the time October rolls around, and USA Today’s Bob Nightengale reported this morning that the Cubs are already keeping a close eye on Boyd’s workload after he posted a 4.10 ERA in his last seven starts. Horton, meanwhile, has been among the very best pitchers in baseball since the All Star break with a 0.86 ERA in eight starts, but even he has thrown more than 74 pitches in just one of his six starts during the month of August. With Horton and Boyd likely to join Shota Imanaga at the front of Chicago’s rotation for the playoffs, it would make sense for the Cubs to try and ease off the gas for those players while leaning on their depth for the stretch run.

The problem with that plan is that Chicago’s depth has been taxed heavily by injuries. Front-of-the-rotation lefty Justin Steele has been out almost the entire year due to UCL surgery, and since then the Cubs have also lost both Jameson Taillon and deadline addition Michael Soroka to the injured list. Javier Assad has looked quite good since returning from his own stint on the injured list, but other arms will need to join him in helping lift up the front of the rotation if the Cubs are going to be able to rest Boyd and Horton this September.

That’s where Civale comes in, as he can join with other back-end starters and swingmen the Cubs have at their disposal like Assad, Ben Brown, and Colin Rea to help take the load off of Chicago’s projected playoff starters. At the very least, he should be able to serve as a capable bridge to players like Soroka and Taillon, who may be activated off the injured list before the end of the regular season. It’s also possible the Cubs will be able to get something more than innings out of Civale, given his past success and the solid enough 4.28 FIP he posted during his time with the White Sox.

In exchange for Civale’s services, the Cubs will pay the remainder of the right-hander’s $8MM salary for the 2025 campaign. That should free up some money for the White Sox as they look ahead towards the 2025-26 offseason and hope for better days next year. It will also provide opportunities for other arms to step into the rotation and show what they can do ahead of the offseason. Perhaps that will include Wilson, who was outrighted off the White Sox roster back in June after surrendering a 6.95 ERA in 45 1/3 appearances. Now that he’s back on the roster, perhaps Wilson will be able to finish the season strong at the big league level as he heads towards what will likely be free agency in the offseason, unless he pitches so well that the White Sox are convinced to tender him a contract for 2026.

As for Cosgrove, the lefty has a 2.25 ERA across four appearances with the Cubs this year after spending most of the season at Triple-A. He’s logged 70 big league innings in total over the past three years, the majority of which came as a member of the Padres, and in that time he’s pitched to a 3.86 ERA with a 4.07 FIP. The Cubs will have one week to try and pass Cosgrove through waivers, at which point they’ll have the opportunity to assign him outright to the minors if he goes unclaimed.

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