The New Zealand heavyweight produced a positive sample in a drugs test conducted on the day of his 11th-round stoppage versus English fighter Ipswich-born Wardley.
Fabio Wardley together with Joseph Parker engaged in a thrilling bout in London on 25 October to determine who would become WBO mandatory challenger to unified heavyweight titleholder Oleksandr Usyk.
Parker had positioned himself as the leading contender to challenge the champion following compiling a remarkable six-fight winning streak, however placed his mandatory challenger status on the line in the UK and suffered a stoppage in round eleven.
A standard screening conducted on the boxer via the anti-doping organization the day of the match returned positive and leaves the veteran boxer with a battle to demonstrate his cleanliness.
Parker's promotional company published a statement stating: "The anti-doping body notified all relevant parties about Parker returned an adverse finding after a drug screening carried out on the 25th October. During the ongoing inquiry, no further statements are planned at this time."
Joseph Parker became titleholder in 2016 before he lost the WBO title through a points decision against Anthony Joshua in Wales in 2018.
Joseph Parker has been a regular competitor across the United Kingdom since then, competing in eight bouts altogether in Britain and relocating to the Irish capital for fight camps with highly regarded trainer Andy Lee in recent years.
Under the tutelage of Lee, the boxer recovered from the 2022 setback to Joe Joyce to secure several successes positioning him at the front of the line to face Usyk prior to he lost to Wardley.
Following Parker returned a positive test when he fought Wardley, reportedly involving cocaine, an investigation regarding the results has commenced.
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Ashley Carter
Ashley Carter
Ashley Carter