OAKLAND, Calif. (October 1, 2012) -- Texas Rangers general manager Jon Daniels says someone posted a homophobic slur on pitcher Derek Holland's Twitter account Sunday that was directed at a heckler.

Major League Baseball is investigating the post, which was quickly taken down. Holland said Monday in Oakland he was pitching at the time and he didn't do it. He noted that only his fiancée, Lauren, had access to his account and she told him she was not involved. He also checked with family members, who said they knew nothing about it.

Daniels calls it a "serious issue, it's an unacceptable term to use."

Less than two weeks ago, the Toronto Blue Jays suspended starting shortstop Yunel Escobar for three games for wearing eye-black displaying a homophobic slur in Spanish during a game against Boston.