Johnny Manziel was reportedly involved in a fight at friend's wedding at a Hawaiian hotel Friday.
The former Heisman Trophy-winning Texas A&M quarterback had been arguing with the man for a while, before punching him during the rehearsal dinner at the Four Seasons Resort, according to TMZ Sports.
Sources told TMZ that Manziel was being hounded by the other man before Manziel punched him in the face.
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Police said they were not called to the hotel that night.
The next day, Manziel reportedly sent a bottle of champagne to the other man along with a note that read, "Truly apologize. Should have never done that. Know this won't make it better, but hope it starts the day off alright."
Manziel remains unsigned and is suspended for the first four games of the 2016 NFL season due to violation of the league's substance abuse policy.
The Cleveland Browns cut Manziel two years into his rookie contract after trading into the first round to select him with the 22nd pick of the 2014 NFL Draft.