Sydney Roosters star Mitchell Pearce faces a possible six-match suspension and $A50,000 fine after arriving back in Sydney from a Thai rehabilitation clinic.

Pearce will know his fate this week when the Roosters board meets.

Upon his return to Australia, Pearce apologised for his behaviour and declared: "I totally humiliated myself."

Pearce, 26, spent a month in the northern Thailand facility after a drunken Australia Day incident when he was filmed simulating a sex act with a dog.

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Upon his return, he was greeted by his mother Terri and father Wayne, a former Test player, and Roosters chief executive John Lee.

Sydney's Daily Telegraph reported the club's management is working closely with the NRL Integrity Unit to determine Pearce's penalty.

"I deserve the punishment, I totally humiliated myself and a lot of other people," a humble Pearce said. "I'm not hiding from anything, I'm here to cop whatever comes and we'll just wait and see what happens."

Lee said Pearce's punishment could be decided within the next "couple of days".

"There will be a meeting of the board to talk through the next steps and we will be in consultation with the NRL during that process," he said.

"It will at least be a couple of days before we get more clarity about what will happen next."