The WBC heavyweight champion wrote to the British Boxing Board of Control two weeks before the fight in Las Vegas, which was fought instead under a Nevada licence.
However, an investigation launched by Ukad continues into claims Lancashire-based farmer Martin Carefoot lied to help Fury escape tougher doping sanctions in 2017.
Ukad is currently examining whether Carefoot was a credible witness before Fury and his cousin, Hughie, received retrospective two-year bans.
The Furys blamed levels of banned steroid nandrolone in 2015 on eating uncastrated wild boar or contaminated supplements. Carefoot’s evidence was supplied to the watchdog via Fury’s legal team, but the boxer now says he had never met him.
Earlier this month, Carefoot made fresh allegations in the Mail On Sunday that he was offered £25,000 to concoct a story that he supplied Fury meat on a regular basis.
Carefoot signed two witness statements saying he provided wild boar to the Furys. The evidence was reportedly passed to the boxers’ lawyers, Morgan Sports Law, who gave them to anti-doping investigators. The second included a line that read: “I supplied a range of animal meats and offal to Team Fury, including wild boar and pigs.”
Both fighters insisted they “never knowingly or deliberately committed a violation” and were allowed to resume their boxing careers from December 2017 after accepting backdated two-year doping bans. Last week, Frank Warren, Fury’s promoter, dismissed Carefoot as a “fantasist”.
Both Furys returned positive tests for banned anabolic steroid nandrolone in February 2015 but were not charged by Ukad until June 2016. Between the two dates, Tyson Fury won the WBA, WBO and IBF world heavyweight titles from Wladimir Klitschko.
Fury later suffered with depression and abused both drugs and alcohol during a 30-month spell away from boxing after his win over Klitschko. Since his return in June 2018 he has been held up as an inspiration as a result of his dramatic weight loss and a run of wins that culminated in him becoming world champion for the second time by beating Wilder in February to claim the WBC belt.
Ukad says fresh inquiries are at an early stage. The British Boxing Board of Control confirmed the initial report on Boxingscene.com that Fury had relinquished his licence. His Nevada licence is not affiliated with the World Anti-Doping Agency.