Bailey had an MRI on Friday morning that showed a sprained posterior capsule in his right shoulder. Manager Dusty Baker says there's no timetable for Bailey's return.
Right-hander Mike Leake was recalled from Triple-A Louisville to start Friday night against the Braves. Leake is starting in place of struggling righty Edinson Volquez, who was optioned to Louisville on Monday.
Bailey left Thursday's 10-4 loss at Philadelphia after four innings with the injury. His early exit put more stress on the staff one day after a 19-inning loss to the Phillies.