Dodgers right-hander Chris Withrow was diagnosed with a tear in the ulnar collateral ligament in his right elbow, which could result in Tommy John surgery, the team announced Thursday.
Withrow, who had been optioned to Triple-A Albuquerque on May 21, was put on the major league disabled list after being examined by team physician Dr. Neal ElAttrache, who recommended the surgery.
The Dodgers said Withrow, 25, would seek a second opinion before deciding on treatment.
Withrow joins Angels left-hander Sean Burnett on the list of pitchers in need of Tommy John surgery. Burnett, who missed most of last season because of a torn tendon in his elbow, went down again Tuesday night while pitching against the Seattle Mariners.
Burnett is expected to visit orthopedist James Andrews next week to determine if he will undergo a second ligament-replacement operation.