Mark Prior started the season on the disabled list, and he may end it there.
The Chicago Tribune reported on its Web site Friday night that the right-hander would not accompany the team on its trip to Denver but would go back to Chicago to have his shoulder examined by team physician Stephen Gryzlo.
The Cubs' brass became concerned after Prior was knocked around in an 8-6 loss to the Milwaukee Brewers on Thursday. Pitching coach Larry Rothschild said a dip in velocity in the third inning couldn't be explained and prompted the exam.
"We'll see what comes of it," Rothschild told the Tribune. "There were some pitches he threw [Thursday] that I didn't like the way he threw. We have to make sure of what's going on where he is and go from there."
Rothschild said Prior didn't complain of pain or discomfort.
"He's felt good," he said. "The [side sessions] he has done, the preparation before the games he has said he has felt good all along. He threw the ball better, but he wasn't throwing the way he's fully capable of."
The season is lost for the Cubs, and Prior is a part of that. He's been on the DL twice this season, with a strained shoulder and a pulled oblique muscle, and has stumbled to a 1-6 record with a 7.21 ERA in nine starts.