Boston Red Sox right-hander Scott Atchison has been diagnosed with a torn ulnar collateral ligament, and he could be facing Tommy John surgery.
Manager Bobby Valentine said Atchison would seek a second opinion before determining whether to undergo the operation.
Atchison has been out since July 14, originally due to right forearm tightness, and he suffered a setback during Friday rehab appearance for Class AAA Pawtucket.
He had been a valuable member of the Boston bullpen this year, going 2-1 with a 1.76 ERA in 37 appearances.
The news comes on the day the Red Sox dealt right-handed reliever Matt Albers, along with outfielder Scott Podsednik, to the Diamondbacks for left-handed reliever Craig Breslow.