The NRL Integrity Unit has re-opened its investigation into a boozy incident involving dumped captain John Sutton and former player Luke Burgess during the club's high-altitude camp in Arizona.

As revealed by Fairfax Media, the incident left a bouncer with blood dripping from his head while the players were left handcufffed by the side of the road. The new information has prompted the NRL to reopen the case file.

In a statement released on Wednesday morning, the governing body said: "The NRL Integrity Unit said today it has re-opened its investigation into an incident involving two South Sydney players in the United States late last year.