Brisbane coach Anthony Griffin believes the composure of future NRL stars led by Dally M Toyota Cup player of the year Ben Hunt can complete a stunning premiership victory over Canberra on Sunday.

The young Broncos pulled off a miraculous final play to beat the New Zealand Warriors last weekend to advance Sunday's grand final.

They were in ninth position five weeks out from the end of the season after winning just three of their first name games.

"We've got eight 18-year-olds. We're a younger side," said Griffin.

"We probably just weren't ready for the intensity and the standard in that first half of the season.

"But we've learned as a group and put a pretty good patch of form together."

Griffin said Hunt, fullback Josh Hoffman, five-eighth Jared Kahu and hooker Andrew McCullough had displayed wonderful qualities as Brisbane played for survival over the past nine weeks.

"Those guys play with a lot of calmness and composure," he said.

"We had to keep winning to get into the eight. We've been completing at really high rates which is a sign your decision makers are playing with a real calmness under pressure."

A flukey Michael Spence chip kick on the last play of the game, which deflected back into his hands, presented Tom Butterfield the match-winning try against the Warriors

"That's what you get when you keep yourself in the game," said Griffin of the great escape after his side was down 26-18 inside the last 10 minutes.

"To still be in a position to win the game in the last minute wasn't lucky even though the end try was lucky.

"We earned the right to get that luck at the end."

"I'm just really happy for them that they're going to experience a week like this and play in the last game because they've got talent and they've grown as players into a mentally tough bunch.

Griffin can make amends for denying the Broncos reserve grade side Toowoomba a Queensland Cup grand final victory in 2006.

He coached underdogs Redcliffe to an upset that year and also took the Dolphins to last year's grand final.

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