GOLD Coast's Brayden Crossley is on provisional suspension after testing positive to a banned substance.

It is believed the substance detected in a late May test, after a NEAFL match, by ASADA is a cocaine metabolite.

Crossley, who turns 20 next week, has not played senior football this year, after managing 10 matches in his 2018 debut AFL season.

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Crossley has indicated to the Suns he will vigorously defend himself in the ASADA case, which could see him banned for four years.

The Crossley story was broken by Andrew Hamilton of The Courier-Mail.

Crossley, drafted by the Suns out of their Gold Coast Academy at No.52 in 2017, is the second AFL player whose fate is currently in the hands of ASADA, with Collingwood's Sam Murray effectively serving a provisional ban after a positive test from July 2018.

An illicit drug, cocaine is viewed as performance enhancing when detected by in-season ASADA testing.

"The club supports the role of ASADA and will fully cooperate during this process," the Suns said in a statement.

"We are continuing to provide Brayden with wellbeing support and want to stress that it would be inappropriate to pre-empt the outcome of the matter at this time.

"Brayden has sought independent legal advice to assist him going forward.

"The club's public commentary on this issue is governed by strict protocols, and as such under the Australian Football Anti-Doping Code we are unable to provide any further commentary whilst the process unfolds."