If that ends up being the case, Doubront could go on the disabled list retroactively, meaning Boston could call up another pitcher until he returns.
Doubront is keeping active, however. Valentine said that Doubront was going to throw three simulated innings at about 45 pitches before Friday night's game against the Yankees.
"He had a nice active rest period where he's continued to throw on flat ground but nothing off the mound, so we have him a little up and down session in the bullpen today," said Valentine. "There will be another one of those planned where he'll do it longer and then he'll be able to pitch in a game and throw his 100 pitches or so."
Aside from the normal arm fatigue Doubront has felt as he approaches a career professional high in innings pitched, Valentine also said that there's been a knee issue that perhaps led to his rest period.
"So, you know, he had a little knee situation that we wanted to make sure cleared up," Valentine said. "He'll be ready this next week to pitch. If we decide we don't need him until at the end of the week, we might even take that amount of time."