The Reds placed Moll on the 15-day injured list Sunday due to a left shoulder impingement.
The left-hander presumably suffered the injury during Saturday's appearance against the Mets, during which he surrendered three runs on a hit, a walk and a hit-by-pitch without recording an out. Moll will be eligible to return during the final week of the season, but he may have already thrown his final pitch of 2024.