Mitchell Pearce will undergo treatment in an "intensive rehabilitation facility for an extended period" following his admission he has a problem with alcohol.

The Sydney Roosters released a statement on Friday night saying Pearce has gone overseas for treatment.

"Pearce has [on Friday night] departed for the overseas facility with his mother, Terri," the statement read.

"The club's concerns for Mitchell's welfare remain paramount as he seeks treatment."

An emotional Pearce had fronted the media earlier on Friday for the first time since the lewd video scandal and admitted he had a problem with alcohol and said he realised he needed help.

"My behaviour was unacceptable. I'm embarrassed and take full responsibility for my actions," he said.

"I acknowledge I have a problem with alcohol and it is something I have to address.

"It is not an excuse but a realisation that I finally need help.

"Together with the club I'm working on a solution for me to address these issues that will come out in the next couple of days.

"I just want to thank everyone for turning up and I apologise again."

Pearce was stood down from Roosters training after a video showing Pearce engaging in a lewd act involving a dog on Australia Day aired on the Nine Network on Wednesday night.

The 26-year-old, in a seemingly intoxicated state, can be seen in the video forcing an unwanted kiss on a female, who tries to reject his advances.

He then turns his attention to the woman's dog, announcing: "I'll f*** that dog, I don't give a f***, I don't have a sexuality."

Pearce, who was shirtless but wearing shorts, is then seen to simulate sex with the dog, and continues when asked to stop.

"You've peed on my couch. You've peed on yourself. Get out," the woman says.

Roosters coach Trent Robinson said Pearce had apologised to him and his team-mates, but described the behaviour as unacceptable, saying the club and the NRL would discuss the possibility of his sacking over the next few days.

In 2014, Pearce was handed a one-match suspension and a $20,000 fine after an incident at a Kings Cross nightclub.

The incident cost Pearce his spot in the New South Wales State of Origin side, and included in the Roosters' sanctions of 2014 was an agreement to attend alcohol counselling sessions.

The Roosters are also believed to have questioned fellow players Dale Copley and Jayden Nikorima who were reported to have been at the same party as Pearce when carrying out his lewd act on Australia Day.