Matt Kemp will undergo surgery Friday to repair a torn labrum in his left shoulder.

The recovery time will be anywhere from four weeks to four months, depending on what doctors find during the procedure.

"They'll cut it open and see what's going on inside of there," Kemp said. "Hopefully, they just clean it up. If they need to do more, they'll do more, but I won't know anything until I wake up."

Kemp injured his shoulder smacking into the outfield wall against the Rockies in Colorado on Aug. 28.

Before the injury, he was batting .337 with a .584 slugging percentage. After it, he batted .218 with a .427 slugging percentage.