The New Zealand heavyweight tested positive as part of a drugs test carried out on the day he fought in 11th-round loss to English fighter Fabio Wardley.
The British boxer and Joseph Parker were part of an intense contest held in London in late October to decide the identity of the WBO mandatory challenger to unified heavyweight titleholder Oleksandr Usyk.
Parker had been next in line to face Usyk subsequent to compiling a notable six wins in a row, yet risked his shot at the title on the line in the UK and endured an 11th-round stoppage.
A routine test administered to the boxer via Vada the day of the match came back positive which leaves the veteran boxer in a difficult position to clear his name.
The boxer's representatives issued a communique stating: "The agency informed all required parties that Joseph Parker returned an adverse finding subsequent to a drug screening carried out on the 25th October. While the matter is investigated, no more comments are forthcoming currently."
The New Zealand boxer earned the title of world champion in 2016 until he surrendered his championship belt via unanimous decision to Anthony Joshua in Wales in 2018.
The fighter became an active participant across the United Kingdom since then, fighting eight times altogether in Britain and relocating to the Irish capital for training camps under respected coach former champion Lee during this period.
Guided by Lee, Parker overcame his 2022 loss to British heavyweight Joyce to chalk up several successes that placed him at the front of the line to face Usyk prior to he lost to the British fighter.
Subsequent to Parker returned a positive test during the Wardley bout, allegedly for cocaine, an investigation regarding the results is underway.
Elara is a seasoned sports analyst with over a decade of experience in betting markets and statistical modeling.