But pitching coach Don Cooper believes a decision will be made by Saturday, with the likelihood of a five-man rotation returning.
"More than likely, and this is not official, we move one of the guys to the bullpen," Cooper said. "We have off-days coming up, and that's too many days off for a lot of guys.
"We are looking at it and we are going to reassess and see what we have to do. Right now, it is what it is through Sunday."
Waiting until Saturday to make the official call could mean the White Sox will be deciding between the rookie Stewart and Philip Humber, who gave up four runs on 11 hits over six innings during Wednesday's 6-4 loss in 10 innings to the Orioles, in regard to a relief move. The White Sox are off on Monday and then again on Aug. 22 and 25, and want to get as many starts as possible for their front four of Mark Buehrle, Peavy, Danks and Gavin Floyd as they closely pursue the Tigers and Indians in the American League Central.
"Moving a guy to our bullpen will strengthen our 'pen and give us more innings out there," Cooper said. "Right now, today through Sunday, it's all hands on deck. There are no spa days. Everybody is going to be ready every day. We'll do whatever we have to do to try to win the ballgame."