Former world champion Parker produced a positive sample as part of a doping test conducted the same day of his 11th-round stoppage versus UK boxer Ipswich-born Wardley.
The British boxer along with Joseph Parker participated in an intense contest staged in the UK capital on 25 October to decide the identity of the mandatory WBO contender against undisputed world heavyweight champion Oleksandr Usyk.
The fighter had been next in line to meet the champion after putting together a remarkable six wins in a row, but risked his contender position at stake in the UK and experienced a stoppage in round eleven.
A standard screening given to Joseph Parker via the Voluntary Anti-Doping Agency the day of the match returned positive and now leaves the veteran boxer facing a challenge to prove his innocence.
The boxer's representatives released a statement declaring: "The agency notified all required parties regarding Joseph Parker had a positive result after a drug screening carried out on October 25th. During the ongoing inquiry, no further statements are planned at this time."
Joseph Parker became world champion back in 2016 prior to he lost his championship belt by unanimous decision versus Anthony Joshua at the Millennium Stadium in 2018.
The fighter remained an active participant on British soil since then, competing in eight bouts altogether on UK territory and moving to Ireland for training camps alongside respected coach former champion Lee in recent years.
Coached by Andy Lee, the boxer overcame his 2022 loss to British heavyweight Joyce to chalk up several successes that placed him front of the queue to face Usyk before he was defeated to Wardley.
Following Parker returned a failed test on the day of the Wardley fight, reportedly for cocaine, an investigation regarding the results has been started.
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