Mets Notes: Senga, Peterson, Houser, Alvarez

Kodai Senga underwent an MRI on Friday and was diagnosed with triceps inflammation, Mets manager Carlos Mendoza told reporters (including Dan Martin of the New York Post).  Senga received a cortisone shot to deal with the issue and will be shut down from throwing for the next 3-5 days.

The news represents another setback for Senga, who has yet to pitch this season after suffering a moderate posterior capsule strain in his right shoulder during Spring Training.  Senga’s rehab process didn’t have any formal timeline attached, as the most recent reports indicated that he was first working on his mechanics before embarking on any clear ramp-up regiment.  Senga was supposed to toss a bullpen session on Friday before the triceps discomfort shelved that plan.

If there is any silver lining, Mendoza noted that Senga’s shoulder and elbow looked good in the MRI scan, so the triceps area seems to be the only concern at this point.  However, Senga and the Mets will now have to wait out this shutdown period before again re-evaluating the righty’s status.

Senga is already on the 60-day injured list and obviously won’t be activated when he hits the 60-day threshold this coming week, and it would now seem like he might not make his 2024 debut until perhaps after the All-Star break.  Assuming he emerges from this shutdown period feeling better, Senga’s rehab assignment will still take at least a month given that he has to essentially start his preparation from scratch after missing all of Spring Training.  From the Mets’ perspective, surely they weren’t going to take any risks with their ace righty’s health anyway, but there’s even less of a rush to get Senga back onto a big league mound since New York is 21-29 and doesn’t look like a contender.

An inconsistent rotation has been a big reason behind the Amazins’ lackluster record, as only five teams have a worse rotation ERA than the collective 4.59 posted by Mets starters.  Some potential help could be on the way since David Peterson is nearing the end of his 60-day IL stint, and he made his second and potentially final Triple-A rehab start last night. Peterson has a 2.79 ERA over 9 2/3 innings in those two rehab outings, tossing 81 pitches in his first start and then 89 pitches last night.

Peterson underwent hip surgery last November, necessitating a season-opening stint on the 60-day injured list given the procedure’s recovery timeline of 6-7 months.  It seems as though Peterson has gotten through his rehab in good form, so barring any last-minute health issues, the left-hander appears to be on track to be activated from the injured list this week.

Over four seasons and 333 innings for New York, Peterson has a 4.51 ERA while starting 64 of his 80 appearances.  While nobody expects Peterson to step in and be a savior for the struggling rotation, Peterson might at least represent an upgrade over Adrian Houser, who Mendoza said could be moved back to the bullpen.  Houser has a 7.88 ERA in 37 2/3 innings this season, starting his first six games before a shift to the relief corps, and was then inserted back into the rotation as the Mets moved to a six-man staff during a busy stretch of the schedule.  Things didn’t go smoothly for Houser in his return to starting duty, as he allowed six earned runs over five innings in the Mets’ 10-4 loss to the Guardians on May 21.

In another injury update, catcher Francisco Alvarez is expected to take batting practice today for the first time since undergoing thumb surgery back on April 23.  (MLB.com was among those to report the news.). Alvarez was given an eight-week recovery timeline, so it’s a good sign that he is already feeling better enough to face any sort of live pitching.  He has also been taking some pitches behind the plate, catching with a splint inside of his glove — a process that is likely to continue for at least some time after Alvarez returns to action.  The former top prospect was hitting .236/.288/.364 in 59 plate appearances prior to his torn thumb ligament, and this lengthy injury rehab has already drastically reduced what was supposed to be Alvarez’s second full Major League season.