Sizemore is scheduled to fly to Pensacola on Sunday, confer with Dr. James Andrews on Monday and undergo surgery on Tuesday.
"Size is strong and a competitor," Rosales said. "He'll do his best to go through what he did last year. Nobody wants to experience that."
Former A's catcher Landon Powell also sustained the same injury twice in a short span.
"It doesn't happen a lot, but we do have some history with it," A's head trainer
Nick Paparesta said.
Rick Eymer is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.