Queensland's police minister is refusing to reveal how many officers are under investigation for links to a bikie gang with a history of extreme violence.

However, Jack Dempsey says he has every confidence the matter will be investigated thoroughly.

"From time to time we have an officer who may stray away from the professionalism that is exhibited by the majority of police officers," he told reporters in Brisbane.

"But you have to ensure that these matters - and have confidence these matters - will be investigated thoroughly and I have confidence they will be investigated thoroughly."

News Corp Australia is reporting a small number of officers are being investigated by the Crime and Misconduct Commission (CMC) after allegations of improper social contacts with a motorcycle gang with a history of cocaine trafficking and extreme violence.

Mr Dempsey didn't comment on the number of officers involved when quizzed by reporters on Wednesday, however, he said no officers had been suspended.

CMC chairman Ken Levy has confirmed the corruption watchdog is investigating, but hasn't revealed any details.

"There is, without a shadow of a doubt, no pattern (and) no serious endemic problem between police and motor cycle gangs in Queensland. But complaints are made from time to time," he told Brisbane's Courier Mail.

Mr Dempsey said he had every confidence in the ethical standards of Queensland police officers.