Athletics left-hander Dallas Braden needs shoulder surgery.
Braden, who pitched a perfect game against Tampa Bay in May 2010, will have surgery Monday in New York to repair a torn capsule in his left shoulder.
Oakland made the announcement during its game Wednesday in Texas, and said the recovery time will be determined after the operation by Dr. David Altchek, medical director of the New York Mets.
The A's put Braden on the disabled list April 17, a day after he pitched five scoreless innings at Detroit but left early due to a stiff left shoulder. The decision for surgery came after Braden met this week with specialists in Florida and New York.
He was 1-1 with a 3.00 ERA this year.
The Athletics also Wednesday recalled right-hander Trystan Magnuson from Triple-A Sacramento and sent left-hander Jerry Blevins outright to that minor league team.
Blevins had allowed at least one run in six of his last eight appearances and was tied for second among AL relievers with 12 walks.
"Magnuson was throwing the ball extremely well down there, great reports, and he's replacing a guy that was struggling," manager Bob Geren said. "He's a big kid who throws hard, is talented and is eager to learn.
Geren said injured closer Andrew Bailey, on the DL since spring training with a strained right forearm, will pitch in an extended spring training game Saturday. The right-hander will throw one inning or 20 pitches.