New York Yankees left-hander was rocked in his second rehab outing Wednesday, and we now know why.

Girardi just said on WFAN that Sabathia woke up today with fluid in knee and prob headed for MRI. Unsure what's next for him. #yankees — David Lennon (@DPLennon) July 3, 2014

The Yankees were hoping to get him back in the rotation after the All-Star break, but that could be unrealistic depending on the results of the MRI.

Sabathia has been out since May 10 with the injury and the Yankees are mired in a five-game losing streak heading into action Thursday night.