"Try as he might, Jake Peavy isn't what he used to be. Surgery to reattach a torn lat will take something out of a pitcher, and the White Sox right-hander is coming to grips with the reality that he won't be at full strength this season.

Next season might be another story after his 12-to-18-month full recovery. For now, Peavy will throw his fastball a little slower than he's accustomed to.

''The last few starts was a grind physically," said Peavy, who was moved off his scheduled start Sunday to Tuesday at Kansas City. ''I don't think that was any secret if you watched. I'm looking forward to getting pushed back and getting back on my feet.''

Peavy admitted that his relief outing against the Nationals on June 25 took something out of him. He said he was going on adrenaline and passed up the opportunity for an extra day of rest after that 55-pitch effort on his side day. His ERA is 7.72 ERA since then.

"I may have been riding a little high after the relief effort and wanted to pitch a couple more times," Peavy said. "I thought my body and arm would respond better than it did.''

Phil Humber will start Sunday in the series finale against the Tigers. Mark Buehrle, Peavy and John Danks are probables for the Royals series next week, although Danks, coming off the DL, isn't official.

Danks threw six scoreless innings for Class AAA Charlotte on Friday against Louisville."