A major league source told the Globe this afternoon that Red Sox left fielder Carl Crawford wants to get Tommy John surgery on his left elbow next week and plans to approach the team with his request in the next 48 hours. General manager Ben Cherington said today that request has not come as of yet. "It's a situation we are monitoring and we will continue to work with Carl to determine a course that is best for him and the team," Cherington said. Crawford partially tore the ulnar collateral ligament in his elbow in April and was given an injection of platelet-rich plasma, a procedure that in some cases promotes healing. The injection has little effect and Crawford came off the disabled list in July, saying he was willing to play with pain with the team still in contention. Crawford has hit fairly well in 29 games (.287/.313/.500) but has said that he expects to get the surgery. Throwing, he said, remains painful.