The New Zealand heavyweight tested positive in a doping test administered on the day he faced 11th-round stoppage to British heavyweight Fabio Wardley.
Fabio Wardley together with Joseph Parker participated in an intense bout staged in the UK capital in late October to determine the identity of the mandatory WBO contender to unified heavyweight titleholder Ukrainian champion Usyk.
Joseph Parker was previously the primary candidate to meet Oleksandr Usyk subsequent to compiling an impressive six consecutive victories, yet risked his mandatory challenger status at stake in the UK and endured an 11th-round defeat.
An ordinary examination administered to Joseph Parker through Vada the day he fought came back positive and leaves the veteran boxer facing a challenge to clear his name.
The boxer's representatives issued a statement stating: "The agency alerted all relevant parties regarding Joseph Parker tested positive following a doping test carried out on the 25th October. During the ongoing inquiry, no more comments will be made for now."
Joseph Parker earned the title of titleholder six years ago until he was defeated for the WBO title via unanimous decision against Anthony Joshua in Cardiff 24 months later.
Parker became a frequent visitor in the UK since then, having eight matches in total on UK territory and transferring to the Irish capital for fight camps with esteemed mentor Andy Lee during this period.
Guided by Lee, Joseph Parker bounced back from his defeat in 2022 versus British heavyweight Joyce to secure a string of victories that placed him at the front of the line to meet the champion prior to he lost to the British fighter.
After Parker returned a failed test on the day of the Wardley fight, allegedly for cocaine, an inquiry into the findings has commenced.
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