Dereck Chisora has been released by German police following his brawl with David Haye at a post-fight press conference in Munich, but both fighters could now face lifetime bans.
Haye and Chisora clashed after Chisora's defeat by defending WBC champion Vitali Klitschko in the Olympiahalle on Saturday.
Chisora remains on notice with German police but he was allowed to travel to England on Sunday, while Haye is expected to release a statement on Monday.
"He still faces a charge of simple assault but he is allowed to return to England for now," a Munich police spokesman, Gottfried Schlicht, is quoted in the Guardian as saying.
The embarrassing spectacle came after Chisora had slapped Klitschko at the weigh-in prior to Saturday's bout, and spat water in the face of Wladimir Klitschko in the minutes prior to the fight.
The boxer, who has previous convictions for public order offences, assaulting a police officer and assaulting a former girlfriend, could now be handed a lifetime ban, along with Haye, for their roles in the post-fight scrap.
"It's a possibility," British Boxing Board of Control General Secretary Robert Smith told the BBC. "The board have many powers. They can fine, they can suspend and they can withdraw a licence."
The ugly scenes occurred after Haye attended the news conference to criticise Klitschko, who he accused of reneging on an agreement between the pair.
However, Haye's outburst angered Chisora who left the news conference table to confront Haye, appearing to shove the former champion and initiate the fracas which continued for five minutes.
Chisora accused Haye of "glassing him" during the fight, before threating to shoot him.
"David, I'm gonna shoot you. I swear to God, David, I'm going to fuckin' shoot you. I'm going to shoot you. I'm gonna shoot David Haye. I am going to shoot David Haye," he said.
"If David don't fight me, I am going to physically burn him," he added.
And Smith believes the brawl ranked among of the lowest moments in British boxing history.
"I'm very disappointed and very saddened that in a sport I love I have to deal with this," he said.
"I have to speak to the German Boxing Federation and German police and then take appropriate action. This is not good, it's bad, we have to deal with it accordingly."