Collin McHugh, who began the season on the disabled list with tendinitis in his pitching shoulder, will miss the nextsix weeks, this time with an elbow issue.
The Astros announced Saturday McHugh has a posterior impingement of his right elbow. It will not require surgery, and he'll be reevaluated in six weeks.
The 29-year-old right-hander struggled in a rehab start at Triple-A Fresno Thursday, and left after only one inning with tightness in his elbow.
"We expected him to go five innings," Astros manager A.J. Hinch told reporters, via MLB.com. "It certainly caused him to come home. It's unfortunate that he had a little setback. He didn't finish his outing, so we're certainly disappointed for him.
"He had some tightness in his elbow and in his bicep and did the right thing by calling the trainer out and getting out of the game."
McHugh went 13-10 with a 4.34ERA last season, a letdown from his 2015 campaign (19-7, 3.89 ERA) in which he finished eighth in AL Cy Young Award balloting.