Mitchell Pearce's playing career is set to be on hold while he enters an overseas rehabilitation clinic for alcohol problems as the NRL confirmed it was investigating alleged text messages detailing the behaviour of Sydney Roosters players at the Royal Oak Hotel and the party where the NSW Origin playmaker later disgraced himself on video.

Images of the alleged text messages from a fellow partygoer, who claimed to have caught a taxi with Pearce and teammates to the apartment of a woman where the heavily intoxicated 26-year-old Roosters captain was filmed in simulated sex act with a dog, were posted on social media on Friday. The text messages make reference to "liney lineys" which can refer to cocaine.

While the NRL integrity unit is checking the veracity of the texts to make sure they are not part of a social media hoax, Fairfax Media understands investigators are treating them seriously.

According to the alleged texts, Pearce was "whaled" and had been "humping Bella" while another person at the party named Jack filmed the events. It was suggested that an approach would be made to the Daily Mail to buy the footage and within a day digital media exchange company Diimex was offering the video to media outlets. The alleged exchange reads as follows: