Yankees pitcher Andy Pettitte left Friday's win over the Indians early with back stiffness and his status is in question. Pettitte revealed that he thought he strained his back while working out between starts, which forced him to miss his usual bullpen session between games. "I guess it's a little bit of old age," Pettitte said. "That's all I can tell you. I literally wasn't doing anything. I felt great working out, I lifted my legs and it was just one of those freak accidents." Pettitte said that the Yankees were aware of the injury. He bent over with stiffness in the fourth inning on Friday night, and stayed on the mound to record six more outs before leaving the game. "We've got to try to knock this out," manager Joe Girardi said. "Hopefully it doesn't linger, because the longer it lingers, the less work [Pettitte] can do and be prepared for his next start."