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03/17/11 7:47 PM ET

Peavy treating illness, expects to start Saturday

White Sox right-hander experiencing flu-like symptoms

GLENDALE, Ariz. -- After a one-day absence due to an illness, Jake Peavy returned Thursday morning to the White Sox camp, but only to be examined by the team's medical staff.

Peavy was diagnosed with a stomach virus and was given fluids and medication before he was sent home to continue resting in hopes he could still make his regularly scheduled start on Saturday. All his vital signs, the club also announced, were routine.

There was a lot less of Peavy in the trainer's room than there had been on the Goodyear Ballpark mound on Monday, when he had stretched out to four innings against San Diego in the third start of his remarkable comeback from the torn tendon behind his right shoulder.

The right-hander has lost weight to two days of general body discomfort associated with the virus.

Nevertheless, Peavy, who was not accessible to the media on Thursday, remains on the docket to start on Saturday against the A's in Phoenix Municipal Stadium.

"As far as I'm concerned, he's still on," said White Sox pitching coach Don Cooper. "He's just had the yips, throwing up and diarrhea and stuff. I'm not taking him out. He might take himself out, but I'm not."

After the White Sox's exhibition game in Maryvale against the Brewers, manager Ozzie Guillen also expressed optimism that Peavy would remain on schedule.

"I don't know. I have to go get all the information on him. But I hope he will [pitch]," Guillen said. "This is a kid who wants to be on the mound. I expect him to be right there."

Tom Singer is a national reporter for MLB.com. Follow @Tom_Singer on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.