Yankees first baseman Mark Teixeira aggravated his troublesome left calf on the final play of Saturday night's 5-4 loss to the Orioles. And there's some concern that it was more than just a tweak.

According to Bryan Hoch of MLB.com, Teixeira will undergo an MRI on the calf Monday and has already been ruled out for the Yankees' entire three-game series with the Red Sox that begins on Tuesday night. If the exam reveals another strain, it's possible that he will be done for the rest of the regular season.