THE AUSTRALIAN Sports Anti-Doping Authority will continue to keep its distance from the AFL's investigation into Greater Western Sydney midfielder Lachie Whitfield. 

Whitfield is under investigation for allegedly avoiding drug testers by staying at the home of then Giants welfare manager Craig Lambert last year. 

Lambert and Graeme 'Gubby' Allan, the former Giants football boss who this week was installed as Collingwood's new head of footy, have also been cooperating with the inquiry. 

ASADA has confirmed it was briefed by the AFL Integrity Unit on Thursday. 

"On 1st September, the AFL's Integrity Department briefed ASADA on their investigation into the conduct of a current listed player of the GWS Giants Football Club and two former members of staff of that club. A copy of the investigator's report was provided to ASADA at that meeting," ASADA said in a statement. 

But the anti-doping watchdog left the case in the AFL's hands, at least for now. 

"The matter remains with the AFL for the next steps to be determined and the AFL will now seek legal opinion on this matter. ASADA will be consulted once this process is complete," the statement read. 

In a statement, the AFL said it will "seek further legal opinion before consulting again with ASADA."

Whitfield, the No.1 draft pick from the 2012 NAB AFL Draft, is expected to play in the Giants' historic first final against the Sydney Swans at ANZ Stadium on Saturday week.