Wide receiver Mansel Simmons was found unconscious early Sunday morning in a parking lot with injuries to his head.
Police told the Moscow-Pullman Daily News that he was transported to Pullman Regional Hospital and then to Sacred Heart Medical Center in Spokane.
Pullman Police Commander Chris Tennant said WSU and Idaho players had been attending a party at a private home when a disagreement occurred.
The fight was fueled by alcohol, Tennant said, and occurred in the parking lot of Sacred Heart Catholic Church in Pullman.
When police arrived, there were about 20 people in the parking lot. They were not fighting but "there was a lot of posturing and discord," Tennant said.
Officers found Simmons, of Elk Grove, Calif., lying unconscious and called an ambulance. He was reported in satisfactory condition with various head injuries.
An Idaho football player has admitted being involved in an altercation with Simmons, Tennant said, but the investigation is continuing and no arrests have been made.
Representatives of both Idaho and Washington State are looking into the incident. The two schools are located just 8 miles apart.
In what appeared to be an act of retaliation, a car driven by an Idaho football player was attacked in the church parking lot shortly after the fight, Tennant said. The car suffered numerous dents and scratches, the mirrors were removed, the driver's door damaged and the car "was basically totaled," Tennant said.
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