Hentges will undergo surgery on Sept. 18 to repair the capsule and labrum in his left shoulder, Mandy Bell of MLB.com reports.
Hentges is expected to need 12-to-14 months to recover, so it's unlikely he'll be ready to pitch in a game until 2026. The lefty has been excellent since being moved to a full-time relief role in 2022, posting a 2.93 ERA and 155:42 K:BB over 138 innings. Hentges is making $1.16 million in 2024 and will be eligible for salary arbitration for a second time this offseason.