Mitchell Pearce has been stood down from training by Sydney Roosters after the NRL club launched an investigation into allegations that their co-captain engaged in lewd behaviour involving a dog.
Video footage emerged on Wednesday appearing to show a drunken Pearce simulating a sexual act with the animal.
In the clip, which is said to have been recorded at an Australia Day party, the 26-year-old is also accused of urinating on a sofa before being told to leave the property.
The Roosters revealed that they will conduct an internal investigation and also confirmed that Pearce will not attend training while they look into the matter.
A Roosters statement said: "The club wishes to advise that Mitchell Pearce has been stood down from training commitments until the club concludes its internal investigation.
"The club continues to work closely with the NRL Integrity Unit and will be making no further comment at this time."
Pearce is a key player for the Roosters and has also represented New South Wales in State of Origin.
He was fined $20,000 by the Sydney side in 2014 following an incident on a night out.
In 2010, Joel Monaghan left Canberra Raiders after admitting to simulating a sexual act with a dog, while Cronulla Sharks sacked Todd Carney in 2014 after a lewd image of the former NSW playmaker emerged online.