Pettitte, originally scheduled to start in the middle game of the Astros’ series with the Chicago Cubs, will instead be headed to the disabled list with a strained left forearm.
Pettitte, who signed a $31.5 million, three-year contract with Houston following nine years with the New York Yankees, suffered the injury last Wednesday in the Astros’ 7-3 win over the Cubs at Minute Maid Park. He was also on the DL from April 7-29.
“He doesn’t have to make himself get back on the mound. He has to do it within his own timeframe, with how his arm feels,” Astros manager Jimy Williams said. “He’s never had this before. He’s had the elbow before but he’s never had the forearm before.”
Duckworth will try to help the Astros break out of their recent slump. Houston has dropped three of its last four, including a 3-1 loss in Monday’s series opener.
Greg Maddux pitched 6 2-3 strong innings Monday before leaving with a mild muscle strain in his right side, and Moises Alou hit a two-run homer to help Chicago win its second straight following a five-game losing streak. Maddux said his injury is not serious.