A fourth Crown Resorts employee has come forward to blow the whistle on the alleged manipulation and tampering of Crown Melbourne casino’s poker machines.

ABC News reported that an unnamed worker has attested to the veracity of the claims of three other ex-Crown casino employees that the casino operator gave its blessing to alter its gaming machines to prevent punters from winning too much.

The new witness was described by the news outlet as someone who worked at Crown Melbourne for many years. The latest witness claimed that he was personally ordered to remove betting options on the Players Choice Super machine because punters were winning too much.

“There was an instance where this particular game was paying out too much on the gamble function so technicians were instructed to remove the gamble button completely,” he said, according to the news agency.