Williamson said Wednesday that he has a full UCL tear in his left elbow and will require Tommy John surgery, Mark Sheldon of MLB.com reports.

EDGE Analysis

Williamson's comments came shortly after the Reds placed him on the 15-day injured list earlier Wednesday. The southpaw had been on the shelf for most of the season due to a shoulder problem, but he avoided surgery and was cleared to make his 2024 debut for the Reds on Sept. 1 after making just one rehab start. He produced a 3.77 ERA, 1.05 WHIP and 12:5 K:BB across 14.1 innings in four starts with the Reds before he ultimately strained his elbow in Tuesday's 6-5 win over Atlanta. A date for Williamson's elbow surgery hasn't been set, but he'll miss the entire 2025 season while he embarks on an arduous rehab process.