Parramatta legend Brett Kenny says NSW enforcer Paul Gallen can become a "very respected" State of Origin player if he rids his game of unnecessary cheap shots.

Maroons forward Nate Myles said Queensland expect Gallen and Willie Mason to rip into their roles with unbridled aggression in Wednesday night's decider with Origin played under more liberal rules than the NRL.

"That's the way he likes to play it," said Myles when asked if Queensland expected Gallen to try to bait them.

Gallen's over-the-top aggression has come under fire this season from former players including Kenny following unsavoury incidents involving Gold Coast forward and NSW teammate Anthony Laffranchi and more recently Parramatta's Josh Cordoba.

Kenny said Gallen didn't need to step over the line to prove how tough he was to his peers.

"I think he's a very good player. He's a tough player and State of Origin suits his style of play," said Kenny who played 15 straight Origins against the likes of Wally Lewis between 1983 to 1987.

"He has to get some things out of his game like putting his hands all over players' faces which you don't want to see in any football.

"If he can get that out of his game he'll be fine.

"But if he gets caught out again I think he'll go."

Kenny said Gallen often worked himself up so much he did things on the spur of the moment that he probably regretted later.

"He gets so hyped up and he wants to lead by example that sometimes his emotions overtake his positive thinking," he said.

"You learn to control those things with experience and I'm sure with someone like Ricky Stuart in his corner he will learn that.

"He's a State of Origin player, he likes to mix it.

"If he can learn to control that and get the cheap shots out of his game I think he can become a very respected State of Origin player."

Kenny said he'd like to see NSW centre Matt Cooper switch sides on Wednesday night to spare Canberra's Joel Monaghan a nightmare Origin debut up against the highly dangerous and unpredictable Greg Inglis.

Monaghan comes in for injured centre Mark Gasnier who after outplaying Inglis in the first game was on the receiving end of the youngster's brilliance in Origin II.

"If he (Inglis) wants to dominate I think he can," said Kenny, who also moved between centre and five-eighth during his career with Parramatta and as a representative player.

"He showed in game two when he was up against the best centre in the world in Mark Gasnier, who NSW expected to dominate, and played all over him.

"He's got that much potential it's not funny. To be honest I'm not sure they will be able to control him unless they get up very quickly on him.

"If it was me, I'd move Matt Cooper onto him.

"He's been outstanding defensively in both games and in this day and age of professional football you should be able to play either side.

"But Inglis is such a quality player you just have to hope he has an off night."

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