In May 2015 Whitfield reportedly stayed at the home of former Giants welfare manager Craig Lambert on the advice of then football manager Graeme Allan out of fear of failing an illicit drugs test.

The events took place after Whitfield’s ex-girlfriend made contact with Allan and raised the issue of illicit drug use by Whitfield.

Allan waited until July last year to inform the club.

The Giants immediately contacted the AFL triggering the ongoing investigation.

Whitfield is expected to play in next week’s final against the Swans.

GWS have employed a senior lawyer to conduct an investigation into the allegation of avoiding drug testers.

Allan has been appointed as the football director of Collingwood and Lambert is the Brisbane Lions welfare manager.

Allan was expected to be unveiled as Collingwood’s new football manager on Tuesday.