The A’s announced a broad slate of roster moves Tuesday. In addition to their previously reported selection of Henry Bolte‘s contract from Triple-A, they’ve also selected Michael Stefanic‘s contract and placed shortstop Jacob Wilson on the 10-day injured list due to a left shoulder subluxation. Infielder Brett Harris was optioned to Triple-A as well, while minor league righty Eduarniel Núñez was designated for assignment. Additionally, the A’s noted that catcher Austin Wynns, whom they’d previously designated for assignment, cleared waivers and was released.
As covered this week, Bolte has been the hottest-hitting prospect in the minors. He’s a plus runner with developing pop who recently rattled off hits in an astonishing 12 consecutive plate appearances to boost his batting line to a mammoth .348/.418/.658. He’s popped a dozen homers, swiped 17 bags and should get plenty of run in center field with Denzel Clarke still on the shelf. Zack Gelof has been seeing a good bit of action in center, but the former second baseman will probably head back to the infield with both Wilson — whose known shoulder injury now has a formal designation — and Max Muncy on the injured list.
With two infielders shelved, the A’s will turn to Stefanic, who’ll be making his team debut. The longtime Angels farmhand has seen prior action in parts of four major league seasons. He’s mustered only a .227/.314/.267 slash in 289 big league plate appearances, but the 30-year-old Stefanic is a prolific Triple-A hitter. He’s played parts of six seasons at the top minor league level and touts a .326/.422/.447 batting line with a tiny 9.5% strikeout rate. Stefanic has marginal power, bottom-of-the-scale sprint speed and below-average defensive skills, but scouting reports from Baseball America, FanGraphs and MLB.com have placed 70 and 80 grades (on the 20-80 scale) on his pure hit tool over the years.
Núñez, 26, was one of four players the A’s acquired in last year’s blockbuster sending Mason Miller and JP Sears to the Padres. That package was headlined by top prospect Leo De Vries and also included a pair of quality rotation prospects in Braden Nett and Henry Baez. Núñez was the clear “fourth” prospect in the deal. The hope was that he could quickly reach the majors and give the A’s a power arm to plug into their bullpen, given that he’d already had a brief MLB call-up in San Diego and was enjoying success in Triple-A at the time of the swap.
In a way, that proved true. Núñez made his A’s debut just two days after the trade deadline last summer, but he struggled out of the gate. He pitched eight innings with the Athletics and was tagged for eight runs on nine hits, seven walks and a pair of hit batters. Núñez did fan nine batters, but when accounting for all the walks and the pair of batters he plunked, those nine punchouts only represented 23% of the opponents he faced.
Lackluster debut notwithstanding, the A’s surely had some hope that Núñez could turn things around in 2026. That hasn’t happened. Núñez has a respectable 4.61 ERA through 13 2/3 innings (2 1/3 in Double-A, 11 1/3 in Triple-A), but he’s walked 11 of his 67 opponents (16.4%) and plunked another two batters (3%). Since coming to the A’s organization last summer, Núñez has faced 155 batters between the majors and minors. A whopping 19.3% of them have reached base without putting a ball in play, whether by walk or hit-by-pitch. He’s also tossed six wild pitches in a total of 33 1/3 innings.
As concerning as the poor command — if not more concerning — is the precipitous velocity drop Núñez has experienced this season. He sat 98.1 mph on his four-seamer last year but is at an even 95 mph so far in 2026. Last year’s slider sat 88.5 mph. This year, it’s at 87 mph.
There’s no known injury for Núñez. He hasn’t been on the injured list and most recently pitched only two days ago. However, between the velocity drop and the poor command, the A’s probably feel there’s a chance they can pass him through waivers and hang onto him as non-roster depth. That may well be the case, but Núñez is a 26-year-old with a decent track record in the upper minors and a pair of minor league option years remaining. If he’s healthy and another club feels the velocity drop and/or command are fixable with some mechanical adjustments, it’s at least possible he’ll be claimed or flipped to another club in a small trade.
The A’s will have five days to trade Núñez or place him on outright waivers. The waiver process would take another 48 hours, so his DFA will be resolved within a maximum of one week.
It’s Henry Bolte time!