New York Yankees first baseman Mark Teixeira underwent an MRI that showed "irritation" to his calf injury. As a result, the Yankees have announced they will be without the slugger for another 10-14 days, reports Erik Boland of Newsday:

Yankees announce MRI showed "irritation" of Tex's calf strain and he'll be out "10-14 days." Also, Melky Mesa to be called up

— Erik Boland (@eboland11) September 10, 2012

Teixeira has been hampered by a calf injury since the end of August. While he was able to suit up for the Yankees Saturday during their contest against the Baltimore Orioles, he reinjured his calf. This prompted New York to estimate they’d be without their first baseman for at least four days, a total that has now been increased to upwards of two weeks.

Over 439 at-bats with the Yankees this season, Teixeira has hit .255/.336/.478 with twenty-seven doubles and twenty-three home runs. While his production has continued to decline this season, the 32-year-old is still an important source of offense for a Yankees team that’s attempting to hold off the Orioles and Tampa Bay Rays in the American League East.