Shoulder discomfort sidelines Guzman

Chicago Cubs reliever Angel Guzman, already on the shelf because of knee surgery, has come up with an achy right shoulder. Guzman tried to throw and get loose on Wednesday during pregame drills but complained about pain in his shoulder to Cubs trainer Mark O'Neal.

"He had some discomfort in his shoulder," Cubs general manager Jim Hendry said. "We just felt coming off of the [arthroscopic meniscus surgery] he's had on and off difficulties in the past, so we thought that we were just going to take the precautionary route."

Guzman said he expects to be ready to go on the field in a week to 10 days.

"I still think I will be back in a week or week and a half," Guzman said. "My knee is the main thing. I don't think the shoulder is anything I have to worry about."

Guzman pitched in a career-high 55 games with a 2.95 earned-run average last season.

Bruce Levine covers baseball for ESPNChicago.com.