Pettitte threw approximately 40 pitches at Yankee Stadium before the Bombers' game Tuesday against the Tigers, and though he completed the session, Pettitte still has some hesitation to throw with full intensity.
A MRI exam taken Tuesday at New York's Columbia-Presbyterian Hospital revealed what the Yankees said is a "small, persistent strain" of Pettitte's left groin. Pettitte will continue throwing off flat ground, but will not set foot on a mound.
"I'm feeling good. I'm feeling better," Pettitte said before leaving Yankee Stadium. "But when I reach back 100 percent, like I'm trying to get a batter out in a game, the groin area grabs."
Pettitte has been on the 15-day disabled list since he strained the groin in a July 18 start against the Rays.
The veteran had been working out at the club's Minor League complex in Tampa, Fla., before rejoining the Yankees on Saturday in Kansas City. The initial diagnosis at the time of Pettitte's injury had been four to five weeks for a Major League return, but general manager Brian Cashman said that he does not have a definite timetable to expect Pettitte back.
"We've just got to give Andy the time he needs," Cashman said. "The time frame is taking longer than any of us would want, but it is what it is. We'll get him right and we'll get him ready, but we can't get it sooner than it'll be ready."
Cashman complimented the work that Dustin Moseley has done filling in for Pettitte in the rotation, while also mentioning that if they should need to dip into the farm system, right-hander Ivan Nova is knocking on the door for an opportunity at Triple-A Scranton/Wilkes-Barre. Cashman said that he does not foresee an August waiver-wire deal to bring in a starting pitcher.
"I don't anticipate any more moves," Cashman said. "I think this is the team we've got and we're looking forward to playing the string out and seeing where it takes us."