A legal battle involving the Brisbane Roar continues to threaten the club's survival, with court documents revealing the Queensland Rugby Union (QRU) are owed more than $60,000 in unpaid rent from the A-League club.

Despite winning three championships in the last five years, the Roar's debts have mounted.

Court documents obtained by the ABC show the A-League club's owners, the Bakrie Group, owe the QRU $60,900 in unpaid rent.

The QRU's application to the Supreme Court said the Roar was insolvent and should be wound up

The matter is heading to court on August 19.

The players union said its members have not been paid their superannuation, signing bonuses or medical entitlements, while past and present staff have revealed they are also owed superannuation.

'It took months and months to get paid'

It was one of a string of unpaid bills that has left the Roar offside with its suppliers.

Hart Sport's Greg Hartman has had a long association with the Roar as a sponsor and supplier but it crumbled under the weight of unpaid bills.

Greg Hartman says Brisbane Roar did not have an answer for him when he asked about funds. ( ABC News )

"They just didn't have the funds. We obviously asked 'when's this coming?' But they couldn't give an answer, they didn't know know," he said.

"It just went sour.

"I suppose they just ran out of money at some point and no-one had any warning, certainly not us as sponsors or suppliers.

"I think it went past the reminder stage ... we knew the guys, we spoke to them a lot about it, it took months and months to get paid."

Laundry owner Dennis Beecraft, whose family has worked with the Roar for eight years, is owed $10,000.

"The impact is quite heavy of course, the Roar is probably one of our top three clients so not to get paid ... it's pretty upsetting," he said.

Laundry owner Dennis Beecraf is owed $10,000 by the Brisbane Roar. ( ABC News )

"We work with monthly accounts and we often put in from our own business to make the day-to-day runnings.

"When you don't get paid after six, eight or 12 weeks ... it's very telling on the business.

"All the contact from the Roar has just expired ... nothing. We'll just wait and see what QRU are doing and how they respond."

Other sources have told the ABC that suppliers called in debt collectors and threatened to take legal action.

'That's where the brand will really start to hurt'

The bad publicity could have a lingering effect in a tough market.

Allan Bonsall from Brand Genetics said anything that suggests that there was a bad management structure or there had been bad membership decisions was going to impact on the Roar's ability to attract good sponsorship.

"That's where the brand will really start to hurt," he said.

"Roar is the one that's exposed at the moment because the speculation is against them.

"If you're in that situation surely the best way to combat that is to get out there and start telling people what's going on.

"That may be embarrassing to a certain extent but the embarrassment soon fades."

The Roar has declined interview requests.

Their only comment came early last week, when chairman Chris Fong wrote to members saying: "The club's owner, the Bakrie Group, has injected millions into the economy ... and paid significant amounts to use Ballymore".

Mr Fong said the group was well advanced in negotiations to sell the Roar and the funds from the sale would solve the current problem.

It may, but it is not the club's only legal battle, with the lawyer for ex-coach Mike Mulvey confirming he is still pursuing an unfair dismissal case.