Yankees manager Joe Girardi listed Jeter as his designated hitter, one night after Jeter was forced to leave New York's 5-4 win over Boston due to a nagging bone bruise in his left ankle.
"I don't know how much improvement he had overnight," Girardi said. "I talked to him when he got here today and I said, 'How do you feel?' And he says, 'Great,' like he always does."
Girardi told Jeter that he would write his name in as the DH, but reserved the right to change the lineup if Jeter appeared hobbled during batting practice. Jeter aggravated his injury legging out an eighth-inning double-play ball.
"I know today when he says he feels great, he doesn't really feel great," Girardi said. "For him, a lot of times, 'Is it tolerable?' would be a better question to ask him, because he's going to play beat up. That's just who he is.
"Usually you can tell by his face. You can't really listen to his words. You can tell by his face how he's really feeling."
Eduardo Nunez made the start at shortstop in place of Jeter. Girardi joked that he thought Nunez would be prepared against Boston left-hander Felix Doubront after repeatedly facing Andy Pettitte in his simulated starts.
Girardi said that the bone bruise seems to affect Jeter more when he's rounding the bases, but the injury could mean a few more days at DH for Jeter, who has appeared in 140 of the Yankees' 142 games entering play on Thursday.
"Last night was a little more [pain] than what I've seen, and that was a little alarming," Girardi said. "The way I saw him walk after the game made me feel a little bit better last night, but as I've said, walking and running are two different things."