The New York Yankees say lefty Jordan Montgomery will have Tommy John surgery to fix an elbow injury that has kept him out of action since early May.
The surgery will be performed on Thursday, the team announced.  Montgomery left the game on May 1 against the Houston Astros after throwing just seven pitches. The team diagnosed him with a flexion strain in the elbow and originally said he would lose six to eight weeks.
The 25-year-old is 2-0 with a 3.26 ERA this season.
The surgery will probably keep him out until the end of the 2019 season, at the earliest.
With Montgomery lost for the season, he reinforces the belief that the Yankees will seek to add a starting pitcher before the trade deadline. They already needed another pitcher because of inconsistent starts of some of the arms in their rotation.
Coley Harvey of ESPN contributed to this report.