Former world champion Parker returned an adverse finding as part of a anti-doping examination conducted on the day he faced 11th-round loss to English fighter Fabio Wardley.
The British boxer and Parker were part of an intense encounter staged in the UK capital last October to decide who would become WBO mandatory challenger facing reigning heavyweight king Oleksandr Usyk.
The fighter had been the primary candidate to meet Oleksandr Usyk subsequent to putting together a remarkable six-fight winning streak, however put his shot at the title in jeopardy in London and suffered an 11th-round defeat.
An ordinary examination administered to Joseph Parker through Vada on the day of the bout showed an adverse result and now leaves Parker in a difficult position to clear his name.
The boxer's representatives published a communique declaring: "The agency alerted everyone involved about Parker had a positive result after a drug screening administered on the fight day. As the investigation continues, no additional comment will be made for now."
The New Zealand boxer earned the title of world champion back in 2016 before he surrendered his championship belt via unanimous decision to Anthony Joshua at the Millennium Stadium 24 months later.
Parker has been a frequent visitor on British soil from that point, having eight matches in total in the UK and relocating to Dublin for preparation under respected coach former champion Lee during this period.
Coached by Andy Lee, Joseph Parker bounced back from the 2022 setback against Joe Joyce to chalk up several successes that placed him at the front of the line to face Oleksandr Usyk until he suffered defeat to the British fighter.
After the boxer produced a positive test when he fought Wardley, reportedly involving cocaine, a probe into the findings is underway.
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Timothy Haynes
Timothy Haynes
Timothy Haynes
Timothy Haynes
Timothy Haynes
Timothy Haynes