Pirates move Mitch Keller to 60-day IL, recall Brandon Eisert to active roster

The Pirates announced that right-hander Mitch Keller has been placed on the 60-day injured list with a right arm teres major muscle injury. The team said Keller will not be eligible to return for the remainder of the regular season, removing one of Pittsburgh’s top starting options from the stretch run.

A teres major injury is a setback for any pitcher because the muscle is important for shoulder and upper-back function during the throwing motion. While recovery timelines vary by severity, a 60-day designation indicates the club expects a longer absence and less margin for re-evaluation as the schedule tightens.

With Keller sidelined, Pittsburgh recalled left-hander Brandon Eisert to the active roster. The move gives the Pirates an immediate replacement option, and it also reshapes how the staff will absorb innings in the weeks ahead as managers balance starts, long relief, and bullpen workload.

From a roster standpoint, the 60-day injured list is more than a bookkeeping move. Because players on the 60-day IL cannot return during the remainder of the regular season, it effectively locks in the absence for the final phase of games and forces the club to finalize its rotation and bullpen usage plans without that arm.

The timing also matters for how Pittsburgh has to approach its pitching matchups. Keller’s presence would have influenced the Pirates’ midweek and weekend plans, including which starters could work deep into games and which bullpen arms would be conserved for higher-leverage situations.

For Eisert, the recall represents a chance to contribute to a staff that will likely rely on flexibility. Left-handed pitching can be a valuable tool in late-game platoons and against lineups constructed to target specific handedness, and a recalled southpaw can shift the balance of bullpen availability.

Looking forward, the key questions for Pittsburgh are how the rotation will be stretched and whether additional depth moves become necessary if innings pile up. Keller’s placement on the 60-day IL means the short-term focus becomes keeping the rest of the starters healthy while managing bullpen stress until regular-season baseball turns over to October.

Because the announcement comes through a news report that summarizes the team’s action, readers should treat the specifics as preliminary until the team’s own transaction listing and injury confirmation are reviewed. Even with that caveat, the operational impact is clear: the Pirates are planning without Keller for the final stretch and have already adjusted the active roster accordingly.