Frankie Montas won't throw a baseball until at least late May after undergoing right shoulder surgery.

The timetable could allow him to pitch for the New York Yankees in the second half of the season.

Aaron Boone said the labrum of the right-hander was cleaned up during the procedure Tuesday and Montas' rotator cuff did not need to be repaired. Montas won't throw for 12 weeks.

"Everything went according to plan," Boone said. "We're day one out of surgery, so we have a long way to go from there. We're hopeful at some point he can get back but I don't want to best case, worst case."

The Yankees acquired Montas from the Oakland Athletics on Aug. 1. He posted a 6.35 ERA in eight starts and didn't start after Sept. 16 due to inflammation in his pitching shoulder.