The besieged Broncos have resisted calls to stand down star players investigated over an alleged sexual assault in a Brisbane nightclub toilet, naming an unchanged team for their knockout weekend NRL finals clash.

The club put on a united front amid speculation the NRL club could face a sponsorship backlash over the cubicle controversy.

Broncos and Queensland Origin stars Karmichael Hunt, Darius Boyd and Sam Thaiday were named in media reports as the players questioned by police.

A 24-year-old woman alleged she was sexually assaulted in the male toilets of the Alhambra Lounge in inner-city Fortitude Valley on Saturday night.

Broncos boss Bruno Cullen said the club had "taken further steps" to co-operate with police after meeting with officers in charge of the investigation on Tuesday morning.

The Broncos have been under intense scrutiny since the allegations broke on the weekend - and it seems there is no let up in sight.

Police Minister Judy Spence said the police investigation could take weeks.

Behavioural expert, Griffith University's Michael Jeh, said the club should "take a stand" and suspend the trio for binge drinking, regardless of the investigation's outcome.

But the Broncos included the trio for their crucial NRL finals clash against Melbourne at Suncorp Stadium on Saturday night.

Broncos players screamed "get out of the way" and "vultures" as they walked past media to their dressing rooms after their training session.

The Queensland government - one of the club's major sponsors through the Transport Department - tried to rally around the club.

Juggling her duties as Police and Sports Minister, Spence asked the public not to pre-judge the club, denying the Broncos name had been tarnished and urging people to support Brisbane at Suncorp Stadium this weekend.

The Transport Department was always going to re-evaluate their Broncos sponsorship at the end of the season.

But Premier Anna Bligh made it clear what the government expected from the club.

"Obviously any sponsorship we have would need to meet community standards but it's far too early to be jumping to any conclusions," she said.

"The real test is how they deal with those difficulties so I expect this club, like any other, to enforce its code of conduct and I think it's a bit early to be jumping to any conclusions."

Principal sponsor WOW Sight and Sound would not comment.

The only Broncos correspondence came via a Cullen statement.

"This morning I met with two senior police officers in charge of the police investigation and we covered the process followed to date by both parties," Cullen said.

"We also confirmed our resolve to work together to ensure all the facts are presented by all witnesses.

"The Broncos have taken further steps this afternoon to make sure this happens in an orderly and practical manner and as soon as possible."

Cullen said he had kept NRL boss David Gallop updated but would not comment further on the police investigation.

The Broncos have a history of taking swift action on players.

Four players have recently been sacked by Brisbane for alcohol-related incidents.

Despite Brisbane's off-field dramas, Melbourne did not expect the Broncos to be distracted this weekend.

"All I can say is I know Brisbane is a very professional outfit, have been for a long time and with blokes in charge of them like Wayne Bennett and Darren Lockyer I'm sure they won't let it affect them too much," Melbourne skipper Cameron Smith said.

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