Questions have been raised over Queensland's team management after fresh claims of drunken behaviour emerged from an Origin III camp described by players as "more like an end of season trip".

But a Queensland player described allegations that some Maroons took a home-made party drug before last week's 28-16 loss to NSW as "absurd".

Queensland Rugby League boss Ross Livermore has launched an investigation after The Australian newspaper reported claims some players were mixing prescription sleeping drug Stilnox with energy drink Red Bull, said to have a similar affect to taking cocaine.

It has emerged that coach Mal Meninga and another senior official were at a team drinking session at Brisbane's Regatta Hotel before Origin III, on a night popular with students.

As part of "Frat Night Wednesday", the Regatta offers free entry and cheap drinks to students - a potentially dangerous location for an intoxicated high profile player in an already strife-torn NRL season.

A witness said one big name Maroons player was clearly heavily inebriated while another Queensland star upset an 18-year-old by crudely propositioning her.

It occurred on July 8, one week before game three and in keeping with Meninga's edict allowing players to let their hair down until July 10 before focussing on securing the first Origin whitewash by Queensland since 1995.

Meninga allowed his players to savour an historic fourth straight series win ahead of game three because tight NRL scheduling prevented the Maroons fully celebrating their game two victory in Sydney.

However, it is believed some players kept drinking after the Friday deadline with allegations some partied at Surfers Paradise into early Tuesday morning, the day before the match.

One NRL club official told AAP when their players returned, they said the game build-up was "more like an end of season trip than an Origin camp".

Maroons backrower Dallas Johnson admitted the Origin III camp was "more relaxed" than others.

But he laughed off allegations that players had mixed Stilnox with Red Bull.

The combination has the effect of party drugs and allows players to avoid testing positive as Stilnox is not on the World Anti-Doping Agency's prohibited drugs list.

The Australian reported officials from three NRL clubs were aware of allegations some players were using Stilnox in the Origin III camp.

But Johnson told AAP: "It's pretty absurd.

"I suppose it was a bit more relaxed but we were still focussed on the game and what we were trying to achieve.

"It was 1995 the last time someone had won 3-0. That was our main focus all camp, unfortunately it did not go our way.

"But we are passionate Queenslanders. We were playing for our mates and playing for our state - we didn't want to let anyone down."

Johnson believed the allegations had tarnished their historic achievement.

An NRL club official was reportedly "disgusted" with the condition of their players when they returned from Origin camp.

But Cowboys boss Peter Parr - who had three players in camp - said he had no knowledge of misbehaviour.

"We will hear what the word is from the (QRL) investigation, if any - I am not particularly concerned," he told AAP.

Maroons assistant coach Trevor Gillmeister took the newspaper allegations with a grain of salt.

"They (newspapers) tried to derail us before the second game, saying we supposedly wrecked a bar at Terrigal and that kind of crap which had no substance to it whatsoever," he said.

The NRL said they would monitor the QRL's investigation with interest.

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