"He's doing OK," Valentine said. "The training room thought another day would be best. And being that he doesn't play today, he actually gets two days. Hopefully he'll be OK when we get to Baltimore."
While the Red Sox have yet to publicly identify what Ellsbury's injury is, one report said that it was a strained lat muscle.
Valentine doubted that Ellsbury will be shut down for the season.
"If it comes to that, yeah," Valentine said. "[But] he says he wants to play."