Adelaide United's Danish forward Ken Ilso Larsen was suspended Friday after testing positive for cocaine.
The 32-year-old returned a positive sample for benzoylecgonine -- the drug's main byproduct -- in January and is now under investigation by the Australian Sports Anti-Doping Authority.
Football Federation Australia said his provisional suspension was mandatory under its anti-doping rules.
"While it is in place, Mr Larsen is prohibited from participating in the A-League and all other WADA (World Anti-Doping Authority) compliant sports," it said.
Ilso Larsen said he was "working closely with the PFA regarding my situation and awaiting the results from the B test" in a statement issued through Professional Footballers Australia.
"Until these results are received, I cannot make any further comments," he added.
"To our fans, please ensure the focus is on the team. It is a critical time in our season and they need you most of all."
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