The team hasn't made it official, but Peavy said before Tuesday's game against the Mariners that he's talked to general manager Ken Williams.
"I just saw the doctor, and I think we're going to have to go the conservative route," Peavy said. "Obviously, I wanted to try to push through it and do what we needed to do, but I think we're looking at the disabled list just because of the MRI result and how my exam just went with the doctor."
The strain is considered mild, but it is high in the muscle near where it connects to the pelvis, so greater precautions will be taken.
"You don't want to (push) a little tear or strain or whatever it is and we got a little bleeding and some stuff going on," said Peavy, who was making his fifth start Sunday since returning from the disabled list. "It's not bad, but if we continue to push it and let it linger ... ."
Peavy was removed from Sunday's game against the Detroit Tigers in the fourth inning. He had been dealing with a sore right groin since his May 30 start at Boston and aggravated it Sunday while trying to cover first base. He continued to pitch, giving up six runs in the inning.
An MRI on Monday confirmed he suffered a mild groin strain.
"I'm hoping when we give it this week here and the week on the road as far as treatment and I'm sure they'll push me to have a rehab start and I'm sure I'll push against that," Peavy said. "But I'm hoping it's only a few weeks to go back out there and be with the boys and be a contributing factor."
The former Cy Young winner was working through an ankle strain when he was traded to the club in 2009. He blew out his latissimus dorsi muscle and needed surgery last season. When rehabbing from that injury this spring he went through a bout of rotator cuff tendinitis.
The right-hander said he learned from his lat issue of a year ago and how pushing things led to a worse injury. That played into the cautious route the White Sox will use this time.
"Absolutely," he said. "That's what we talked about more than anything. With the ankle leading to mechanical issues and changing the arm angle and look where we got. If you go back and look at Sunday ... in the second (inning) it grabbed me hard and we got a wrap on it and I took some pain medicine. In the fourth when I tried to make those pitches to (Miguel) Cabrera and when you look after that, I made some awful pitches, walked three guys, and had walked one going into that start. Some things changed. We saw that and figured we can't take that risk again."
Manager Ozzie Guillen said before Monday's game that the White Sox will return to a five-man rotation for as long as Peavy is out. They had been using a six-man rotation since Peavy came off the disabled list on May 11.
Doug Padilla covers the White Sox for ESPNChicago.com.