The Boston Red Sox have reinstated right-hander Michael Wacha from the 15-day injured list, the team announced Friday.
Wacha is set to start Friday's game against the Seattle Mariners.
The 30-year-old had gone on the IL on May 8 after experiencing soreness on his left side during a bullpen session. The team described it as "left intercostal irritation" when making the move.
Wacha (3-0, 1.38 ERA) signed a one-year, $7 million deal with the Red Sox during spring training. He has been one of the team's best starters, allowing two or fewer runs and going five-plus innings in each of his last four starts.