NEW YORK -- Hardly 100 percent, Jorge Posada nonetheless returned to the Yankees' lineup on Sunday with an improved left index finger and a word of caution.

"I just pray that he doesn't get a foul tip off his finger today," manager Joe Girardi said. "That's my biggest concern. Physically, the rest of his body's pretty good except that finger."

Posada, who injured the finger on a foul tip in Wednesday's game against the Rangers, reported no ill effects after catching a bullpen session Saturday. But he has not played in a game since Wednesday, and the Yankees cannot -- and would not -- simulate the effects of another foul tip off the finger.

Instead, they're banking on a little luck.

"It's fine," Posada said. "I'll be fine."

Still, the finger is sore, and Posada expects the pain to remain with him for the rest of the season. Because there is no bone break, he should not need anything more than continued treatment.

"It's going to go away in the offseason," Posada said.

But the winter remains many games and many foul tips away.

Posada, 38, is hitting .277 with 17 home runs this season, his first since right shoulder surgery last year.

The Yankees did not have an update on Sunday on starting pitcher Sergio Mitre, who left Saturday's game in the seventh inning after a line drive struck his right forearm. Mitre is due to throw his regular bullpen session on Monday, at which time the team should be able to determine whether or not he can make his next start.