Former world champion Parker produced a positive sample during a doping test carried out on the day he faced 11th-round loss to British heavyweight Fabio Wardley.
Fabio Wardley together with Parker engaged in a thrilling encounter in London on 25 October to determine who would become mandatory WBO contender against reigning heavyweight king Ukrainian champion Usyk.
Joseph Parker had been the primary candidate to meet Usyk subsequent to putting together an impressive six-fight winning streak, but risked his contender position at stake during the bout and experienced a stoppage in round eleven.
An ordinary examination given to Joseph Parker by Vada on the day of the bout came back positive and leaves the veteran boxer in a difficult position to demonstrate his cleanliness.
His promotion team issued an announcement declaring: "Vada notified all required parties that Joseph Parker had a positive result after a doping test conducted on October 25th. While the matter is investigated, no additional comment will be made for now."
Parker became heavyweight champion in 2016 until he was defeated for his WBO belt via unanimous decision against British star Joshua in Wales in 2018.
Joseph Parker remained an active participant on British soil from that point, fighting eight times altogether in Britain and relocating to Ireland for fight camps alongside highly regarded trainer former champion Lee during this period.
Coached by Andy Lee, the boxer bounced back from his 2022 loss against British heavyweight Joyce to achieve a string of victories that placed him front of the queue to meet Usyk until he lost against Wardley.
Following Parker returned a positive test on the day of the Wardley fight, allegedly for cocaine, a probe regarding the results has commenced.
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