THERE will be no investigation by the AFL into a series of allegations against the Brisbane Lions involving drugs and match-fixing until they have substantiated evidence to do so.

Stories run by The Courier Mail over the past two days have alleged a number of behavioural issues at the Lions including illicit drug taking, illegal gambling and match fixing between 2002 and 2009.

It also alleges the reason for a Lions' player's absence from the team was fabricated to cover up an issue with the illicit drug policy.

The AFL will not be investigating at this stage, however.

"The AFL and its integrity unit are aware of recent claims made to the media regarding the Brisbane Lions between 2002 and 2009," an AFL statement said.

"These claims are unsubstantiated and no evidence has been produced to support them.

"No formal AFL investigation will be undertaken in the absence of credible information or evidence."

The Lions were furious when the story first arose on Monday and have not backed down from their original statement.

"These claims from a 'self-confessed drug dealer' are completely unsubstantiated and do not deserve publicity," they said.

"We have no reason to believe the word of a 'self-confessed drug dealer', but if anyone, including The Courier-Mail, has any evidence with regards to this, or any other matter, it should be referred to either the AFL integrity unit or the Queensland Police.''