Eovaldi is expected to miss the rest of this season and the entire 2017 season after partially tearing the ulnar collateral ligament and tearing the flexor tendon in his pitching elbow. He also had the flexor tendon repaired Friday.
The surgery was performed by Yankees head team physician Dr. Christopher Ahmad at NewYork-Presbyterian Hospital.
It marked the second time Eovaldi, 26, has had Tommy John surgery. He also had the procedure as a 17-year-old high school pitcher.
Eovaldi was pulled from his Aug. 9 start at Boston after just 12 pitches because of elbow discomfort and placed on the disabled list three days later. He missed the final 3½ weeks of last season with elbow inflammation.
Eovaldi was having an up-and-down season. At the end of May, he was 6-2 with a 3.71 ERA and enjoyed one stretch when he won five consecutive starts. But Eovaldi, who was briefly demoted to the bullpen at in July, finishes the year with a 9-8 record and a 4.76 ERA.
He is scheduled to be arbitration eligible after this season and to become a free agent after 2017. The Yankees are unlikely to tender him an offer this fall.