Astros right-hander Collin McHugh will not throw for the next six weeks after being diagnosed with a posterior impingement in his right elbow, GM Jeff Luhnow announced Saturday.

McHugh threw only one inning in a Triple-A rehab start Thursday before leaving the game with elbow discomfort. He had been scheduled to pitch five innings.

"It's unfortunate that he had what looks like a setback because he didn't finish his outing," manager A.J. Hinch said Friday. "I'm certainly disappointed for him."