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7/2/2013 11:14 P.M. ET

Peavy shows positive signs in bullpen session

CHICAGO -- Jake Peavy threw a successful bullpen session, which pitching coach Don Cooper called "light to medium" on Tuesday afternoon

"He did very well," Cooper said. "It was better than I thought it was going to be. We reacquainted ourselves with stretch, full windup, located his fastballs everywhere, changeup, threw a couple sliders, threw a couple cutters and threw some curveballs. So he threw all of his pitches [from the] stretch and full windup, and it went well. He'll have a couple days off, and we'll do it again."

Cooper said Peavy, who has been on the disabled list retroactive to June 5 with a fracture of the left fourth anterior rib, is expected to throw another session on Friday in St. Petersburg.

The right-hander is 6-4 with a 4.30 ERA this season, with 66 strikeouts in 11 starts (67 innings). He left his last start in Seattle on June 4 after 2 1/3 innings with the injury.

Cooper, who said they did not count Peavy's pitches in the session, is impressed with how Peavy's arm strength has kept up even after the lengthy layoff.

"The first couple he threw, I said, 'That's looking good to me right now,'" Cooper said. "Jake, with his savvy, with his experience, he could go out and pitch in a game right now, but obviously that's not what we're going to do because he's still recovering from the problem he had. But everything's looking good on that front."

Konerko returns to White Sox lineup

CHICAGO -- First baseman/designated hitter Paul Konerko returned to the White Sox lineup on Tuesday for the first time since June 23, after missing time with a sore back.

"There's always a little bit of hold your breath, don't know what to expect, even after playing a couple games, you miss 10 days and there's a little bit of suspense," Konerko said. "But the back is at a point where adrenaline will do it good. A game situation actually will make it all go away. There are times where you get back too soon on something and it's actually a hindrance and actually a lot worse than you thought. But it's at a point that last little bit of good being out there."

Konerko, who went 0-for-4 with two strikeouts hitting fifth as the DH in the 5-2 victory over the Orioles, said he took some swings on Saturday and felt he wasn't ready, though he could "see light at the end of the tunnel." He said rest was good at first, though, after a while, he felt sore from sitting or laying around.

"He understands where he's at and how he's doing," manager Robin Ventura said. "I think he's done a good job in the last couple years of being able to manage that. It's not always easy. Even hitting-wise, he's had a better stretch, so to speak, for the last few weeks that he was hitting better, just the at-bats. I don't think you push him aside and say he can't do this, this and this. He's still a quality hitter and a threat in the lineup. He will be productive."

Konerko hit .278 in the month of June with three doubles, two homers and nine RBIs.

Joey Nowak is a reporter for MLB.com. Follow him on Twitter at @joeynowak This story was not subject to the approval of Major League Baseball or its clubs.