Victoria's gambling watchdog has been accused of refusing to investigate alleged misconduct at Crown Casino because whistleblowers who worked at the Melbourne venue want to remain anonymous.

Independent MP Andrew Wilkie has complained that the Victorian Commission for Gambling and Liquor Regulation (VCGLR) overlooked the allegations during a recent review of Crown Casino's licence.

Last year, Mr Wilkie used parliament to detail serious allegations of misconduct against Melbourne's Crown Casino.

He said that ever since, other people have raised concerns about the casino through his office.

But Mr Wilkie said he was stunned after inspectors would not take information from whistleblowers despite the MP setting up meetings with the commission.

The whistleblowers wished to have their names kept private because Mr Wilkie said they "fear for their personal safety".

Andrew Wilkie says it is "unfathomable" the allegations were not investigated. ( ABC News: Matt Roberts, file photo )

Mr Wilkie's allegations will raise a level of concern about how thorough a recently completed review of Crown's licence carried out by the commission was.

"To my mind this is unfathomable. Police and regulators often take information from anonymous sources for investigation — in fact, Crime Stoppers campaigning makes a virtue of this," Mr Wilkie wrote to commission chair Ross Kennedy last month.

In the correspondence he details how the whistleblower and one of his employees went to Crown and easily collected evidence of special plastic picks being handed out to punters and staff showing patrons how to access dangerous continuous play on poker machines.

"It appears extraordinary to me that VCGLR investigators refused to take and act on anonymous information from a whistleblower, yet that whistleblower was able to go straight to Crown Casino and witness exactly the illegal behaviour he wished to divulge," he said.

Mr Wilkie also said commission staff told his team that investigators had been told not focus on the issue of picks being used to allow continuous play.

Sources have confirmed that little effort has been put into examining the practices of Crown when it comes to allegations of providing punters with tools to bypass gaming laws.

A spokeswoman for the commission said it took claims of potential breaches by licensees seriously.

"The VCGLR is considering the concerns raised in the correspondence from Mr Wilkie and will respond in due course," she said.

Minister for Gambling and Liquor Regulation Marlene Kairouz said the commission was continuing to examine evidence about the use of plastic picks on pokies at Crown Casino.

"Anyone with any further information about these matters should contact the commission," she said.

Crown has previously said it would co-operate with investigations.