"Joe Mixon is not reporting for team activities at this time," a school spokesman said in a statement Wednesday. "We will continue to monitor the situation."
Mixon has not been charged with any crimes. But an Oklahoma female student claims that Mixon punched her, breaking four bones in her face.
Mixon met with police investigators Monday, but his attorney has maintained that Mixon "has done nothing wrong."
Mixon, a native of Oakley, Calif., was the top-rated signee in Oklahoma's most recent recruiting class.
The Sooners open fall camp Thursday.