Melbourne's Crown Casino is working with police and Victoria's gaming regulator to investigate a betting scam which is believed to have netted a high-rolling cards player $32 million.

A staff member who looks after VIP gamblers has been sacked over the scam and a gambler has been banned from the premises.

The Herald Sun has reported the scam netted the high roller $32 million, but Crown is refusing to confirm that figure.

It is believed the scam involved the use of the casino's own surveillance system, but Crown is not commenting.

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Crown's surveillance system includes cameras that can pan, tilt and zoom in on gaming tables.

There is extra surveillance in the premium gaming rooms where high rollers put millions of dollars on the line.

In those areas, access is restricted and staff continuously monitor the surveillance system.

Barron Stringfellow, an international gambling security consultant who trains regulatory authorities in Victoria, says it appears the high roller and his accomplice tapped into Crown's security systems.

"Then, through a wireless transmission to his ear during his eight hands of play, he was told exactly what plays would be beneficial to make," he told ABC local radio.

"The problem with casinos is that they believe they are unbeatable.

"And we see over and over again that they're not unbeatable.

"If casinos would monitor for wireless transmissions, they would be able to thwart these plans at the onset."

Corruption in the ranks

Deakin University Professor Linda Hancock, who has written a book on Crown, says it appears the high roller and employee struck a deal.

"How it could happen is that they assign someone to look after all the needs of the premium player," she said.

"Sometimes they can be quite demanding. Sometimes they drink, sometimes they don't. They may have particular food they like.

"This person was accommodated in one of the luxurious villas up on the very high floors of Crown Casino.

"There's a Versace villa. These villas are extremely luxurious. They cost $30,000 a night if you want to rent one yourself.

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"So the whole thing is wired and I guess if there is corruption in the ranks or collusion between the minder and the player, they must have struck a deal."

Victoria Police has confirmed it is involved in Crown Casino's investigation, despite not receiving a formal complaint.

Professor Hancock says there is "no compulsion to report any of these incidences in a public and transparent way".

"You've got vast amounts of money being gambled on a 24-hour basis and most of what goes on there is extremely secret," she said.

Crowns says it is confident of recovering a "significant portion" of the money stolen.