CHICAGO -- Ryan Madson will miss at least a month with a strained muscle in the back of his right shoulder.

Madson strained the Teres Major muscle, in the back of his shoulder, the same injury sustained by Brett Myers that kept him out for two months. Initially, it was thought that the righty, who had a 2.08 ERA in his previous 32 games, would be lost for the season, though they are more optimistic on Monday.

Assistant general manager Ruben Amaro Jr. said Madson won't throw for at least two to three weeks. If he feels all right after that, he could go on a rehab assignment for a week and return shortly after that.

"We're thinking he's going to for at least three weeks," assistant general manager Ruben Amaro Jr. said. "It's at least a month without him being able to pitch at the Major League level."

Back already: That was a quick return for second baseman Tadahito Iguchi. Four days after ending his White Sox career with a 1-for-3 night, Iguchi returned to Chicago.

While it's a different part of the city, Iguchi felt like he never left.

"It's unique feeling to be back so soon after being traded," Iguchi said, through interpreter David Yamamoto. "I have a lot of good memories here. My first day, I was very nervous coming into the Major Leagues."

He got over his 0-for-4 on April 4, 2005, and batted .271 with 15 homers and 71 RBIs. If that wasn't enough, he played on a World Series championship team.

"The whole championship run was a good memory," he said. "I was lucky to come into such a good situation at the right time."

On who they gave up: The Phillies gave up one of their better prospects in lefty Matt Maloney, who they dealt for right-hander Kyle Lohse.

The 23-year-old was a third-round pick in the 2005 First-Year Player Draft, and dominated at Class A Lakewood in 2006, going 16-9 with a 2.03 ERA in 27 starts. In 168 2/3 innings, he allowed 120 hits, with 73 walks and 180 strikeouts.

This performance earned him a two-level promotion. He skipped Class A Clearwater and began the season at Double-A Reading, going 9-7 with a 3.94 ERA in 21 starts, with 115 strikeouts in 125 innings.

"He continued to make progress this year with the double jump," Arbuckle said. "He's on a good track and I think he'll pitch in the big leagues in the not-too-distant future. He's a guy you hate to move. It hurts anytime you lose an arm, but we had to weigh the pros and cons on all these things. Some of the names we've been asked for, we thought this was a deal that was [acceptable]. We have to be aggressive, and you have to give something to get something."

Philling In: As scheduled, second baseman Chase Utley had the cast removed from his broken right hand, switching to a removable split. He will begin range-of-motion exercises.

Coming up: Adam Eaton worked a solid 6 1/3 innings against Washington on July 26, allowing four runs on eight hits. His chance for a 10th win was erased when the Phillies' bullpen couldn't hold the lead. Eaton allowed two runs in the first, but settled down to retire 13 straight from the second to sixth inning. Against the Cubs, the righty is 5-2 with a 4.31 ERA.