NRL chief Todd Greenberg said on Sunday he would refuse to register any future contract if Barba was found guilty.
The Sunday Telegraph is reporting police and the NRL Integrity Unit will investigate three separate incidents, including a heated verbal exchange in the swimming pool area of the hotel in front of several Cowboys players and their partners; an alleged physical clash inside the casino which was caught on CCTV; and another alleged physical incident in the carpark before the pair left together in a taxi.
An emotional Greenberg, who knew Barba from his time as the Bulldogs CEO, said the 29-year-old needed to find a new career path after a spectacular but trouble-marred league career.
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"I'm not going to call for (a worldwide ban) but what I am going to say is that in the jurisdiction that I uphold, there's no place for him", Greenberg said.
Following an investigation by the NRL Integrity Unit, Barba has now been rubbed out of the game.
He was restricted to playing the last five matches of the season for Saints, but made up for lost time in 2018 when he was named in the Super League Dream Team and became the first player to win both the Dally M Medal and Man of Steel.
But after Super League proved to be Barba's saving grace on that occasion, it seems that will not be an option this time around leaving him with no future in the sport.
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But trouble soon followed as he was suspended for 12 weeks when he recorded his second illicit drugs strike after the Sharks' premiership celebrations.
"These decisions affect people's livelihoods, children, so they're big moments and you want to make sure you get them right", Greenberg said.
"This is a guy that now loses his livelihood".
We're not asking you to play, it's a privilege.
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The North Queensland recruit and one-time Dally M Medal victor is facing a life ban from the NRL, a move that would also be supported by the English Super League, effectively ending his rugby league career at the age of 29.