SS Eduardo Nunez left Sunday's game after four innings with tightness and irritation in his left rib cage, the latest Yankee to fall prey to injury.

Results of his MRI were negative and he is day to day. But Joe Girardi did not think he would be available Tuesday when the Yankees face the Colorado Rockies.

Although relieved by the results, Nunez said he was "very tight" after the game and felt pain when swinging the bat and throwing.

"You don't want to make that a six-week injury if it can just be a couple days," Girardi said.

The pain — which Nunez initially thought was a stomach ailment — began in the first inning. It progressively worsened, especially after he struck out in the third.

The injury leaves the already-thin Yankees with few options at shortstop beyond Jayson Nix.

Fellow infielders Derek Jeter (ankle), Kevin Youkilis (back), Mark Teixeira (wrist) and Alex Rodriguez (hip) already are on the disabled list.

Nix shifted to shortstop from third to replace Nunez, and Chris Nelson entered the game to play third.

Nunez has missed three games this season after twice being hit by a pitch last month.