Chicago Cubs pitcher Mark Prior will see a specialist in Los Angeles on Wednesday after cutting short a throwing session due to soreness in his right shoulder. Prior was scheduled to pitch off the mound Tuesday, but he never got there. The shoulder flared up during long tossing. "It wasn't getting loose so we weren't going to try it," pitching coach Larry Rothschild said. The right-hander will be examined by Dr. Lewis Yocum. "He had some posterior cuff irritation that obviously we need to get evaluated," trainer Mark O'Neal said. Meanwhile, first baseman Derrek Lee visited Yocum on Tuesday after he bruised his left shoulder diving to catch a foul ball during the United States' victory over Japan on Sunday at the World Baseball Classic. With the Cubs taking Wednesday off and Prior heading home to San Diego, the organization asked him to see Yocum. O'Neal wasn't sure what tests Prior might undergo.