Kerry Wood went on the disabled list for the second time this season, bothered by a strained muscle.
The 1998 NL Rookie of the Year was put in the DL Sunday by the Chicago Cubs, a move retroactive to July 30.
"I'm disappointed but it's just one start (missed) hopefully," Wood said. "I just need to get some rest and work things out."
Wood started the season on the disabled list before returning on May 2. He missed all of 1999 after ligament-replacement surgery on his right elbow.
Because of cramps in his left side, Wood missed a scheduled start on Thursday. He is 6-6 with a 5.16 ERA in 15 starts this season.
"When you lose Wood and put some young kids out there, you're not going to be the same," said Cubs manager Don Baylor, who has been using three rookies in a makeshift starting rotation.
Wood was voted NL Rookie of the Year in 1998, when he went 13-6 with 233 strikeouts and a 3.40 ERA in 26 starts. He tied a major league record by striking out 20 in a nine-inning game against Houston.
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