The NRL should end the career of Mitchell Pearce, according to the game's women's adviser Catherine Lumby.

Pearce arrived back in Australia on Sunday after a month-long stint in a Thai rehab clinic after his drunken escapade and lewd actions towards a dog on Australia Day.

The Sydney Roosters half-back issued a second apology upon his return, admitting he had humiliated himself and adding he will cop whatever punishment is handed down to him by the club or NRL.

That is likely to be a six-week suspension and $50,000 fine, but Lumby says it will merely be a slap on the wrist.

"Personally I wouldn't [allow him back in the game] because of all the support and education he has had and the fact he is a senior leader who should know better," she told News Corp.

"He has had ample opportunity [to learn]."

Lumby is of the opinion Pearce's actions were an act of aggressive harassment aimed at a female who had rejected his advances.

Meanwhile, Pearce's New South Wales Origin captain Paul Gallen believes calls for a year-long ban are "totally unfair, way too tough and over the top.

"It was a stupid thing to do, it was immature," he said.

"He's away helping himself. Hopefully he can come back a better person, sit out six, eight, 10 weeks of the comp and then come back."

Pearce is likely to discover his fate this week, with new Roosters chief executive John Lees already showing some signs of contrition for the star playmaker.

"There was no violence involved," he told Fairfax Media.

"There was ultimately no bigger crime or major sort of criminal matter, but it's a serious societal issue and that's why we're taking it seriously."

AAP