Former NSW coach Phil Gould has warned the Blues to expect every dirty trick in the book as Queensland attempt to unsettle their State of Origin decider preparations.

Gould, Origin's most successful coach, backed current coach Ricky Stuart's comments that the Blues can expect no favours from the moment they arrive in Brisbane on Sunday night.

"You go up there for a decider and you get to the training paddock and it's not ready and there's people marking the field or it's roped off and there's spies watching you train," Gould said.

"Queensland do you no favours. He (Stuart) is absolutely on the money - don't trust them."

While accusation of pre-game by-play may just be part of Origin build-up, Gould is also well versed in the emotional torrent the Blues will have to overcome at Suncorp Stadium as the Queenslanders farewell Darren Lockyer.

Gould was in charge in 1994 when the Blues went to what was then called Lang Park for Mal Meninga's last game in the maroon - and he engineered a stunning 27-12 upset to send Meninga out a loser.

It remains one of only two wins in a decider for NSW on Queensland soil.

"All those things people talk about happens off the field," Gould said of the emotional build-up.

"This will be decided between the trylines and the sidelines.

"It's the football that will win or lose it, not the emotion.

"It's an important one for the Blues because we've lost five years in a row ... we've got to nail it.

"They've got to make sure the preparation's all about themselves and not what's going on up there."

A master motivator during his coaching days, Gould was confident Stuart had his players in the right head space ahead of the massive clash.

Even the prospect of injuries to key players failed to dampen Gould's confidence of achieving a breakthrough win.

"I've always said with Origin (that) injuries are part of it, but it's not like a club side," he said.

"We just go and get another good player - there is no salary cap, we get the best one available.

"You just bring in another good player and get the job done."

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