TUSCALOOSA, Ala. (AP) -- A former Alabama student has filed suit claiming Crimson Tide football player Kelly Johnson assaulted him at a fraternity pledge event.

The suit, filed Friday in federal court by Logan Herring, is seeking unspecified compensatory damages from Sigma Chi fraternity and Johnson stemming from an incident in September 2010.

The suit alleges the tight end/H-back came up behind Herring and punched and kicked him in the head until he was unconscious after Herring became sick at a pledge event at Johnson's home.

Herring's attorney, Rick DiGorgio of Birmingham, says he's not aware of a police report being filed after the incident. The suit says Herring sustained a concussion and was forced to transfer to another school.

Football spokesman Jeff Purinton says the school can't comment because of federal privacy laws.