Parker was the WBO heavyweight champion from December 2016 to March 2018
Former world heavyweight champion Joseph Parker has denied taking "any prohibited substance" after testing positive for cocaine.
The 33-year-old New Zealander was tested by the Voluntary Anti-Doping Association (Vada) on 25 October.
On the same day, he was beaten by Britain's Fabio Wardley at London's O2 Arena.
Sources have confirmed to BBC Sport that Parker tested positive for the recreational drug, and not performance-enhancing drugs, while his promoted confirmed there had been an "adverse finding" on Friday.
