The NFL Players Association's motion to hold Commissioner Roger Goodell in contempt of court in the Adrian Peterson case will be heard by US. District Court Judge David Doty in Minneapolis on Aug. 13.

The NFLPA, on May 19, asked a federal court to hold the league and Goodell in contempt for not complying with a federal judge's order to send the Vikings running back's disciplinary case back to an arbitrator.

Peterson returned to the Vikings' offseason workouts last week; he was reinstated by the league April 16 after missing 15 games last season while on the commissioner's exempt list or suspended.

The NFLPA filing in May alleged Goodell "deliberately ignored both the court's decision from 11 weeks ago and our repeated requests to comply with that order."

In late February, Doty ordered the league to change its decision to suspend Peterson indefinitely after he was charged with, and later pleaded no contest to, injuring a 4-year-old son with a switch while attempting to discipline the child.

Despite Peterson's reinstatement, the appeal will go on as the NFLPA pushes the court to rule the league violated the collective bargaining agreement.

Arbitrator Harold Henderson hasn't issued a new ruling after Doty's decision, and the NFLPA claims the league instructed Henderson not to act until the NFL's appeal of the ruling to Eighth Circuit Court of Appeals.