BALTIMORE -- The Orioles lost Nick Markakis for the season Saturday night, and the Yankees hope that won't be the case with Mark Teixeira.

But after Teixeira returned from a 10-game layoff and aggravated his left calf strain Saturday, Joe Girardi said he can't rule out that possibility. "There's a part of me that wonders that," he said Sunday. "There's basically 31/2 weeks, and if it [the injury] does go back to square one, then I really wonder."

Girardi said Teixeira will undergo an MRI Monday and added "I'd be surprised" if he can play in the three-game series in Boston that starts Tuesday night.

Teixeira aggravated the injury while trying to beat out a double-play ball that ended the Yankees' 5-4 loss. Replays conclusively showed that Teixeira was safe, and the first baseman is likely to be fined for some of his postgame comments about the umpires.

But a good portion of his remarks dealt with his calf, which he described then as "tight."

The loss of Teixeira would be about as costly as the loss of Markakis, who suffered a broken left thumb when he was hit by a pitch from CC Sabathia. But after Sunday's game, Teixeira said he doesn't think the MRI will show anything that would cost him his season.

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"That would be worst-case scenario," he said. "Let's just hope the MRI says that there's no new injuries or anything. I'll just have to make sure it's a little more healed next time I come back."

Teixeira said that although he probably forced himself back into the lineup a little sooner than he should have, the calf doesn't feel the way it did when he first injured it Aug. 27, a good sign.

"It's not as bad as when it first happened," he said. "I was limping for a couple days when it first happened. It's somewhere in the middle, but we'll see where we are [after the MRI]."