CHICAGO -- After meeting with a doctor and White Sox management on Tuesday, Jake Peavy says he will need a stint on the 15-day disabled list to heal his injured groin.

The White Sox hoped it wouldn't require a trip to the DL, but results from Monday's MRI plus lingering soreness during an exam on Tuesday have the team thinking more cautiously with Peavy, who had offseason shoulder surgery that caused him to miss the first 37 games.

Aside from the MRI, Peavy went through treatments on Monday until 30 minutes after the club's 3-1 win against the Mariners.

"I can tell you I feel a lot better, but I just saw the doctor and think we have to go on the conservative route," Peavy said. "Obviously, I wanted 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 results and how sore my exam was with the doctor. [It's] disappointing, no doubt. I was feeling good and beginning to climb with my arm."

Peavy went 2-1 with a 4.66 ERA in five starts after coming off the DL to start the season, but was injured in his last start at home on Sunday against the Tigers, going just four innings and allowing six earned runs.

Before talking with Peavy following his exam, White Sox manager Ozzie Guillen said the team was likely to play it safe rather than rush the right-hander back into action.

"We've got to see what's best for the ballclub," Guillen said. "That's his push leg. It's not a bad injury, but it's a very dangerous injury and we have to be careful about it."

A move to the DL would also mean the White Sox return to a five-man rotation after expanding to six when Peavy returned on May 11 against the Angels.

Struggling Dunn to sit a few games

CHICAGO -- White Sox manager Ozzie Guillen is almost out of ideas for helping struggling slugger Adam Dunn break out of a season-long funk that has him hitting just .176 with five home runs and 23 RBIs through 188 at bats.

Guillen's most recent idea is sitting Dunn down for a few games to help him hit a reset button on his season mentally -- starting with Tuesday night's game against the Mariners and ace Felix Hernandez.

"I'm going to do it with Dunn the same way I did it with [Alex] Rios," Guillen said. "A couple days out of the lineup hopefully will refresh his mind, [let him] pull his stuff together and hopefully start over. That's the reason why I did it. Hopefully a little break for a couple days will recharge his batteries."

Dunn has also been taking extra batting practice since a four-game series in Toronto at the end of May.

"We've been doing a lot of different things with him and nothing worked," Guillen said. "Right now, we're trying to get him some extra hitting to see if we can fix it. If it doesn't work, then I think we're going to try something different. Just don't hit at all and see what happens."

Guillen said one issue with Dunn might be the switch he made by signing with the White Sox as a free agent this past winter, leaving the National League, where he'd played the first 10 years of career.

"There's no doubt, I don't care what people say, American League pitching is a little deeper than National League pitching," Guillen said. "There's a lot of people out there who have a different opinion, [and] I'll send them my cellular phone number to tell them why. You can put a lot of 'ifs' -- if this, if that -- but I think right now it's just a struggle [for Dunn]. His mind is all over the place and I think right now that's what's killing him, little by little. American League has got good pitching and you've got to make an adjustment."

Is that adjustment more mental or physical, though?

Don't ask Guillen, who seems ready to throw his hands up regarding Dunn's big slump.

"Freaking guy is 7-2 and 700 pounds," Guillen said. "Mentally, he's got a brain bigger than my body. I don't know what it is. To be honest with you, I don't know what it is. You've got to ask him. I talked to him a couple minutes ago. He's fine. When I asked, he says he feels good. I say, 'Oh, that's not a good answer. If you feel good, then I hope you [don't] feel bad.' In the meanwhile, I think the lack of confidence is still there. He's one at-bat [away from] making the fans happy, but it hasn't happened yet."