Carl Crawford's return to the Red Sox has been put on hold yet again.

His latest setback is a mild left groin strain that occurred Thursday night during an injury rehabilitation game for Double A Portland in Manchester, N.H.

Crawford hit a triple to the gap in right field and injured his groin as he turned second base, manager Bobby Valentine said. The Red Sox ended his rehab assignment on Friday.

Crawford cannot play in another minor league game for five days. Once his rehab assignment starts again, the 20-day clock begins anew.

"He's going to get right back in and start hitting again soon in a game," Valentine said. "It's a little preventative thing to make sure it doesn't get hurt."