CC Sabathia was diagnosed with Grade 2 left hamstring strain and could be out at least four weeks.

Sabathia injured the hamstring pushing off the mound Tuesday. The New York Yankees have yet to place the left-hander on the disabled list.

He had a 0.99 ERA in his last six starts. Grade 2 hamstring strains can take four to eight weeks to fully heal.

"It can be an issue when it's a push-off leg," Joe Girardi said. "That's the leg you're using to drive downhill and push off on."