OKLAHOMA CITY—A football fan who says he was attacked in an Oklahoma City bar after being heckled for wearing a Texas Longhorns shirt is suing the bar and an Oklahoma Sooners fan for more than $100,000.

Brian Thomas alleges in a suit filed Thursday that he was left with “serious, painful and potentially permanent” injuries after Allen Michael Beckett grabbed his groin and refused to let go in a bloody skirmish last year.

Beckett, 54, is scheduled to go on trial in December on a felony charge of aggravated assault and battery. He maintains he was defending himself from Thomas at Henry Hudson’s Pub in June 2007.

Beckett’s attorney, Billy Bock said other witnesses at the bar have countered Thomas’ version of what happened a year ago.

According to Thomas’ lawsuit, Beckett began heckling him after he walked into the bar wearing a Texas T-shirt. Thomas tried to ignore it, but decided to leave a short time later, the lawsuit stated.

Thomas said he was at the bar paying his tab when Beckett grabbed him and refused to let go until his scrotum was torn. The injury required more than 60 stitches, Thomas has said.

The lawsuit mentions “a possible connection to a local sports rivalry.”