Sydney Roosters coach Trent Robinson says Mitchell's Pearce's lewd and drunken behaviour on Australia Day was unacceptable.
NSW Origin halfback Pearce has been stood down indefinitely and Robinson said the club will hand down a disciplinary decision in the next few days.
He risks being sacked after video emerged in which he is seen to make unwanted advances to a woman, simulate a lewd act with a dog and is accused of urinating on a couch.
Robinson said on Thursday Pearce's fate would be decided in conjunction with the NRL over the next couple of days after he was stood down by the club.
"The behaviour was unacceptable, we understand that. At the Roosters we can't accept that and we won't," Robinson told reporters.
Earlier, reports suggested Pearce was set to be stripped of the club co-captaincy, which he shares with hooker Jake Friend, and fined $50,000.
The NRL is also likely to impose at least a six-month suspension and his club will add an immediate sacking clause to his contract to be triggered by any further misbehaviour.
He's also expected to be barred from travelling to England next month for the World Club Challenge and abide by a booze ban.
Kick Pearce out of NRL: Lumby
Pearce should be kicked out of the competition, says the league's adviser on women's issues Catharine Lumby.
"My view is get off the paddock if you're going to behave like that to women," Professor Lumby told ABC radio.
"There is no excuse. These guys have been educated and given opportunities to stand up and do the right thing since they were rookies."
In a video, a shirtless and intoxicated Pearce can be seen trying to kiss a female, who rejects his advances and clearly states "I am a lesbian" before he kisses her.
Pearce is then seen to simulate sex with a dog.
"I mean the incident involving the dog as awful as that is to think about, that was a way of harassing that woman," Professor Lumby told SBS News.
"She's asking him to leave he refuses to leave. She's made it clear she doesn't want to kiss him. He tries to force himself on her
The NSW State of Origin representative has been stood down by the Sydney Roosters.
Professor Lumby, who has worked pro bono with the NRL for a decade, does not believe the kind of behaviour displayed by Pearce is rife among NRL players.
But she said it was disappointing and frustrating to see "one or two" incidents of antisocial behaviour continue each year.
"Unfortunately we still see far too much of this," she said.
"It's very clear the NRL worked very hard on behavioural issues and attitudes to women and respect and the players have all had lots of education and ample opportunity to step up to the mark.
"If they don't do it, I think there should be zero tolerance."
In 2014 Pearce was fined and stood down for one match after an incident involving a woman in a Kings Cross nightclub.
Former Roosters star Braith Anasta said he was concerned about Pearce.
"As much as he's done the wrong thing, i'm also worried about him and feeling for him too, because he's made a big mistake but he's not a bad person," he said.
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