Adelaide United midfielder Ken Ilso has been provisionally suspended from the A-League following a failed a drugs test.

Football Federation Australia (FFA) made the announcement on Friday after Danish import Ilso returned a positive A-sample for Benzoylecgonine – metabolite of cocaine – on January 27.

It is prohibited by the World Anti-Doping Code and FFA's National Anti-Doping policy.

Ilso has the opportunity to have his B-sample analysed before FFA takes steps to issue him with an Anti-Doping Rule Violation notice.

.@FFA has provisionally suspended Adelaide United player Ken Ilso Larsen under its National Anti-Doping Policy.https://t.co/CgIgyTQg0z

— Hyundai A-League (@ALeague) March 22, 2019

"To all my fans, team mates, friends and family. I have been notified by the PFA regarding the Adverse Analytical Finding," the 32-year-old said in a statement via the Professional Footballers Association.

"I am working closely with the PFA regarding my situation and awaiting the results from the B test. 

"Until these results are received I cannot make any further comments. I would like to thank the PFA for their support in this testing and frustrating situation. 

"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."

Statement | @thepfa has been made aware of ASADA’s Adverse Analytical Finding by its member, Ken Ilsøhttps://t.co/A2w1LON4Bt

— The PFA (@thepfa) March 22, 2019

Former Midtjylland and Fortuna Dusseldorf attacker Ilso joined Adelaide in 2018, and the veteran has scored three goals in 19 A-League appearances this season.