Red Sox closer Keith Foulke had arthroscopic surgery to repair damaged cartilage on his left knee Thursday, the latest development impacting Boston's ineffective bullpen. Foulke will begin rehabilitation immediately, and team doctor Thomas Gill said recovery from this type of surgery typically takes about six weeks. "Everything went well. We need to let him get ready," Red Sox manager Terry Francona said. "We don't want him to come back too early, so he can come back and pitch when he's supposed to." The moves took place just hours before staff ace Curt Schilling was to pitch in relief for Triple-A Pawtucket with an eye toward joining Boston's bullpen. Schilling, on the disabled list since April 29 with an ankle injury, struggled as a starter in his last rehab outing for Pawtucket. Red Sox general manager Theo Epstein has called Schilling's move to the bullpen "short term." Foulke went on the 15-day disabled list on Wednesday. In his absence, the Red Sox could use Schilling, Mike Timlin and Alan Embree as closers. Timlin got the save Tuesday in Texas, and Embree earned one Wednesday against the Rangers.