Drew was examined by the Angels' medical staff on Wednesday, and the early diagnosis is encouraging.
"Yeah, [it's a] very mild hamstring [strain]," manager Terry Francona said after Boston's 7-3 victory. "When I say mild, they didn't see any bleeding, which is real good. Now again, the disc or whatever, we sent it to [Red Sox medical director] Tom [Gill] and those guys back in Boston, but the preliminary reports are very encouraging."
The Red Sox are off on Thursday. Francona isn't sure if Drew will be back in the lineup on Friday night for the start of a homestand against the Tigers.
"I don't know," Francona said. "I think it all goes on how he feels. I just don't know. Hopefully he'll come back and feel good tomorrow and has a day off and everything, but I really don't know. We can just go on what they say. The MRI looks very encouraging, but if it hurts, you have to wait."
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.