Pettitte checked out fine in tests performed at Kauffman Stadium with head athletic trainer Gene Monahan, who has no qualms about getting Pettitte back in action as he attempts to return from a left groin strain that has kept him out since July 19.
Yankees manager Joe Girardi said that if Tuesday's session goes well, Pettitte could possibly throw in a simulated game by Friday, although it was not clear if he would travel back to Tampa, Fla.
"If he feels good Tuesday, it's possible," Girardi said. "There's some different things we can do. You'd like to keep him off a plane if you could."
Pettitte threw 50 pitches on Friday at the club's Minor League complex in Tampa, but said he was hesitant to let the offerings fly at more than 75 percent.
"Whenever I go to [throw] home and I want to do what I normally do, my body is saying, 'Don't do it,'" Pettitte said. "I really don't know if it's strength or what that is. ... I think it's a little bump in the road. I think I'm going to get there."