Andy Pettitte will turn 41 a week from Saturday, and he’s beyond being firmly rooted in his pitching routines.

The Yankee lefty’s two bullpen sessions between starts have been as much a part of him as the Louisiana lilt to his speech. To deviate is to invite a feeling of uncertainty to the mound, and there could be some uneasy moments as Pettitte returns to the rotation tonight at Yankee Stadium.

After reluctantly landing on the disabled list May 17 because of tightness in his left trapezius muscle, Pettitte was limited to one bullpen session leading into his start against the Cleveland Indians.

"I mean, truthfully, I don’t know [how I’ll feel]," Pettitte said before Sunday’s Red Sox-Yankees series finale. "I’m used to doing two bullpens.

"We’ll just see how it goes," Pettitte said, though his responses indicated that he wouldn’t be surprised if his command was off a bit tonight.

For years, Pettitte has tossed a normal bullpen and a shorter-distanced session between starts.

"I’m not a power guy. I’m kind of a touch-and-feel [pitcher]," Pettitte said. "I’ve felt that [extra session] really helps me, but we’ll see. I mean, I’m not real sure."

But Pettitte has made adjustments before, out of necessity.