That was why Pettitte was sitting in an office at Kauffman Stadium on Saturday afternoon, waiting for an evaluation from head athletic trainer Gene Monahan and looking for some peace of mind to come with it.
"I feel really good today," Pettitte said. "I don't have a lot of soreness in my groin area right now. I just didn't feel real comfortable [Friday]. I didn't feel like I could push when I wanted to. I also feel like if I pushed it too hard yesterday, I'd be sore today, and I'm not."
Attempting to come back sooner than expected from a left groin strain suffered on July 19, Pettitte was working out at the Yankees' complex in Tampa, Fla., and received mixed signals from his body.
When he tried to increase the intensity of his pitches, Pettitte said, "I felt like it was saying, 'Don't do that.'" Pettitte believes it may just be scar tissue breaking up, or an after-effect from too much running in New York, but he would like to know for sure.
"The frustrating part is that I felt like I was ahead of schedule," Pettitte said. "Then I get on the mound and ... mound-wise I wasn't ahead of schedule. I just want to be healthy. I know I'm being cautious and the biggest thing for me is I want to make sure I'm not being too cautious."
The setback has wiped out any chance of Pettitte making a rehab start on Monday or Tuesday, as had been floated. Yankees manager Joe Girardi said that the new timetable could be for Pettitte to play catch on Tuesday and, depending on Monahan's recommendation, go back to the bullpen or a simulated game.
"We told him [it] was going to take time," Girardi said. "Whenever you take time off the mound, you have to get yourself back in shape. I knew that Andy was frustrated the first day, so I'm not surprised that five weeks later, he's still frustrated."