BOSTON (AP) -- Red Sox right-hander Clay Buchholz will miss Sunday's start against the Atlanta Braves because of an illness.
Boston manager Bobby Valentine said Buchholz would likely be skipped and not pushed back. He said the right-hander was not with the team Saturday.
After a slow start, Buchholz has been Boston's best starter, going 4-0 with a 2.40 ERA in June. He was 3-1 in April, but had an 8.69 ERA.
The Red Sox said Aaron Cook will start Sunday.
Cook was placed on the 15-day disabled list on May 6 after suffering a left knee laceration when he was spiked covering home plate.
He made one rehab start with Triple-A Pawtucket on Monday, allowing three runs and seven hits in four innings, and was scheduled to make his second Saturday night before the Red Sox said he'd fill in for Buchholz.
In Fort Myers, Fla., Red Sox outfielder Carl Crawford was hitless in three at-bats, walked twice and scored a run Saturday in a rehabilitation start, his first game action in more than eight months.
Recovering from an elbow injury, Crawford was the designated hitter in a Gulf Coast League game between the Red Sox and Minnesota Twins.
Crawford is expected to play in the outfield this week. He'll be on a rehabilitation assignment for about three weeks.
"You gotta be patient and take time and do everything the right way," he said. "Things go well when you do that."
Crawford thought his day went fine and his elbow felt good.
"I'd like to play as soon as possible and feel as good as soon I can so I can get into the [Red Sox] lineup as soon as I can," he said.