The Queensland Opposition has referred Police Minister Jo-Ann Miller to the Crime and Corruption Commission (CCC) over contact she had with a man who made allegations against Labor MP Rick Williams.

Ms Miller phoned Bruce McLean on Wednesday morning after his allegations against Mr Williams, his former employer, were published by News Corp.

• ‘They will be back’: fears Qld bikies ready to return

The Opposition accused Ms Miller of interfering with a police investigation, even though she rang Mr McLean hours before the matter was referred to police.

Opposition police spokesman Jarrod Bleijie on Thursday wrote to Police Commissioner Ian Stewart and CCC chair Ken Levy asking for them to consider whether Ms Miller broke the law.

“This direct contact by the Minister for Police to a whistleblower seems extraordinary,” Mr Bleijie wrote.

“In doing so, it may be that the Minister has breached the criminal laws of Queensland.”

Ms Miller said she should not have contacted Mr McLean but said she was calling as a friend.

“I never have and I never will interfere in operational police matters,” Ms Miller said.

The Premier said Ms Miller made an error of judgement.

Mr Williams has been stood aside from a parliamentary committee while police look into the matter.