Copping a warning from big Queensland coach Mal Meninga is scary enough.

And a dressing down from Sydney Roosters mentor Brad Fittler would be no picnic either.

But giant Queensland Origin forward Nate Myles can vouch for a much more intimidating force - his big sister.

Ahead of next Wednesday night's Origin II clash at Sydney, Myles reckons he has finally found a balance on and off the football field thanks to some tough love from his older sibling Riley.

The Roosters forward looked to have slipped back into bad habits when he was stood down in late March by his NRL club for breaking a strict alcohol policy.

However, Myles, 23, has turned it around since that "silly" incident to emerge as a leader of the Roosters pack.

So much so that his re-signing for another three NRL seasons this week was seen as a big plus for under-fire coach Fittler's chances of remaining at Bondi Junction.

But Myles doesn't credit a talk with the imposing Meninga after his Roosters suspension for the transformation.

Nor being dropped to NSW Cup by a no-nonsense Fittler.

Nope, the 109kg, 189cm enforcer credits something much more sobering for his resurgence.

"I have been living with my sister," Myles said.

"If she ever sees me getting out of control or doing anything stupid she is the first to pull me into line - that helps."

Myles is the first to admit he got "caught up" in the Sydney lifestyle.

The Cairns boy also conceded it was "tempting" to follow his former flatmate Willie Tonga to the North Queensland Cowboys.

But thanks to "big sis", and another off-field love, Myles reckons he has never been happier.

"It was tempting (leaving Sydney), but one thing that has helped me is that I have a girl in Sydney now - and of course big sis," he said.

"Having that balance on and off the field is what you need to be successful."

Tonga has now become Myles' Queensland teammate after the centre completed a remarkable comeback from serious knee problems to make his first Maroons team in five years.

He has cited the "Sydney lifestyle" as contributing to his successful move to the Cowboys this season.

"I was with 'Tong' before (he left Sydney) so there you go," said Myles with a laugh when told of Tonga's reasons for leaving Sydney.

"That gives you some sort of indication of where we were at."

Myles couldn't have timed his new-found maturity any better.

Stalwart Craig Fitzgibbon is heading to England next year and there are question marks over the future over fellow senior forwards Willie Mason and Mark O'Meley.

And the speculation continues over Fittler.

But Myles has faith the Roosters will turn the corner from the form that has them bottom of the ladder.

"I have no idea to be honest what their thoughts are on the coach," Myles said.

"But as a player I know Freddy (Fittler) gives it his all.

"I know the results haven't shown that, but that comes back to the players.

"However, you can see in the way we have been playing lately we are starting to have a bit more respect and trust for each other.

"It was a tough decision (before re-signing) but for me it came down to the players that we have coming through at the club - it is really exciting from where I see it."

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