Former Oklahoma running back Joe Mixon visited privately with the Cleveland Browns, Cincinnati Bengals, Detroit Lions and New Orleans Saints on Tuesday night prior to his pro day, according to an NFL Network report.

This week will be the first time Mixon meets with teams during the draft process. Mixon was not invited to the NFL scouting combine because of his off-the-field conduct.

Mixon punched a female Oklahoma student in the face in 2014, his freshman year at the school. He initially received a misdemeanor assault charge but accepted a plea deal with one year of probation, counseling and 100 hours of community service. The Sooners also suspended him for the entire 2014 season.

The NFL instituted a new rule this year that bars players from participating in the combine if they have misdemeanor or felony convictions involving domestic violence. While Mixon was not convicted, players can be banned from the combine for any reason.

Oklahoma running back Joe Mixon is talking to NFL teams for the first time as he was not invited to the combine due to his off-the-field conduct. Sue Ogrocki/AP Photo

Lions general manager Bob Quinn said he was disappointed not to be able to evaluate Mixon at the combine.

"I think it's really disappointing that Joe's not here," Quinn said last week. "We come here to see the best college football players in college football. So there's 330, 340-some-odd players here. Him not being here, because of those issues, personally I don't think that's real fair because we have a lot of investigation that we want to do on him and to get him in one spot for all the teams would have been great.

In his two seasons on the field for Oklahoma, Mixon ran for 2,027 yards and 17 touchdowns, and hauled in nine touchdowns on 65 catches.