He was given a random drug test after a senior match late last season and has returned positive A and B samples.
The player had been training with his club until recently.
Leader understands he has received notification from the Anti-Doping Rule Violation Panel of a possible anti-doping violation.
He is awaiting an infraction notice from AFL/AFL Victoria that will outline any sanctions.
The VFL conducts drug education sessions at all of its clubs every year but has had players suspended under ASADA rules.
In 2012 Frankston’s Matt Clark was banned from playing for two years after consuming a drink known as “Hemo Rage’’. It contained the prohibited substance dimethylpentylamine.
In the same year Casey Scorpions player Wade Lees was deregistered for 18 months after purchasing a fat-burning product online. It was intercepted by Australian Customs, which informed ASADA.
The product was found to contain traces of a prohibited steroid.
Lees is now playing US college football as a punter.
In 2013 St Kilda player Ahmed Saad was caught used a banned energy drink.
The AFL Players’ Association has been assisting the player involved in the latest case.
ASADA released a statement in November saying it had become aware of supplements that listed prohibited substances in their ingredients, or “are advertised as containing substances which are prohibited in sport’’.
“As well as reiterating the long-standing warning regarding supplement use in general, ASADA wishes to advise all Australian athletes subject to doping control to be especially cautious of any supplements which list higenamine or DMBA in their ingredient list,’’ the statement said.
It said higenamine was a Beta-2 Agonist and allowed the lungs to take in more oxygen. It is banned both in and out of competition.
“If detected in your sample, you face up to a four-year ban from sport,’’ it said.
The ASADA statement said a survey found that of 67 common Australian supplements analysed, almost one in five contained banned substances.
“ASADA encourages all athletes to think seriously about whether the supplements they are taking are safe, effective and even necessary. It is important for athletes to understand the risks that these products may present to their health, career and reputation.
“Athletes using supplements do so at their own risk because they can be contaminated with prohibited substances. Under the World Anti-Doping Code’s principle of strict liability, athletes are responsible for any substance found in their body.’’
ASADA said today it was unable to comment due to “legislative restrictions’’.