Yankees RHP Luis Severino underwent successful Tommy John surgery on Thursday, the team announced.
Severino also had an existing bone chip in his right elbow removed during the procedure.
Yankees GM Brian Cashman announced on Tuesday that Severino would undergo Tommy John surgery, after complaining of soreness in the top of his right forearm.
The 26-year-old signed a four-year extension worth $40 million before the 2019 season, going 1-1 with a 1.50 ERA over three starts in 12.0 IP as he struggled with injuries throughout the season.
Severino went 19-8 with a 3.39 ERA during the 2018 season, striking out 220 batters in 32 starts. He was an All-Star in both 2017 and 2018, finishing as high as third in voting for the AL Cy Young Award in 2017.
Without Severino for the entire season and without James Paxton for at least the first month of it, the Yankees' starting rotation on Opening Day could potentially consist of Gerrit Cole, Masahiro Tanaka, J.A. Happ, Jordan Montgomery, and Jonathan Loaisiga.