The New Zealand heavyweight produced a positive sample in a anti-doping examination conducted the same day of his 11th-round loss versus UK boxer Fabio Wardley.
Fabio Wardley and Parker were part of a pulsating encounter held in London last October to establish the next mandatory WBO contender facing reigning heavyweight king Ukrainian champion Usyk.
The fighter had positioned himself as next in line to face Oleksandr Usyk following putting together a notable six-fight winning streak, but risked his shot at the title on the line in London and endured an 11th-round defeat.
A routine test given to Parker through the Voluntary Anti-Doping Agency on the day of the bout returned positive and leaves the veteran boxer in a difficult position to prove his innocence.
The boxer's representatives published an announcement which read: "Vada alerted all relevant parties about Parker returned an adverse finding following a doping test administered on October 25th. During the ongoing inquiry, no further statements are planned for now."
Parker earned the title of world champion back in 2016 prior to he was defeated for his WBO belt by unanimous decision against Anthony Joshua in Cardiff 24 months later.
Parker remained a regular competitor on British soil after that, having eight matches in total in Britain and transferring to the Irish capital for training camps alongside respected coach Andy Lee during this period.
Under the tutelage of Lee, Parker bounced back from his defeat in 2022 against Joe Joyce to achieve several successes that placed him as the top contender to face Oleksandr Usyk prior to he was defeated against Wardley.
Following Parker returned a failed test on the day of the Wardley fight, reportedly involving cocaine, an investigation about the test outcome has commenced.
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