BOSTON (CBS) – Red Sox starting pitcher Clay Buchholz was placed on the disabled list Sunday with a gastrointestinal issue.

According to the Boston Herald’s Michael Silverman, Buccholz is in the hospital with the illness.

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In his place, the Red Sox called up Aaron Cook, who was slated to start on Sunday.

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Buchholz had a horrible start to the season, but has straightened things out over the last month.

Overall, he is 8-2 with a 5.53 ERA over 14 starts.

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Cook, meanwhile, hasn’t pitched since May 5, when he allowed six earned runs over 2.2 innings against the Orioles. He received a deep cut on his knee after getting spiked on a play at home plate during that game and was later placed on the disabled list.