Troy Percival said the problem that he was having in Wednesay's game didn't have anything to do with  his right knee, for which he had been on the disabled list, but a stiff back.

"My knee was fine,'' Percival said. "The first time I got up I was actually pretty good, but that last time when I got up my back locked up on me and I had a hard time bending over reaching my spots. I don't anticipate any problems.''

Percival, who has been shaky in four apperances since coming off the DL, allowed a leadoff double and then walked his next two hitters on five and four pitches before being taken out of the game.

Manager Joe Maddon said he would wait to get an update on Percival's condition on Friday before deciding how to proceed with the closer's role, and whether to start mixing in others such as Dan Wheeler and Grant Balfour.

"We've done it both ways this year,'' Maddon said. "We're definitely a better team if Percy's well, absolutely we're better. We'll just see how it all shakes out by Friday and then we'll figure that out.''

Percival said he was confident he could resume his duties, but allowed he "might need a day off here and there.''.