Alexander Ustinov (33-1, 24 KOs), who has been out of the ring since December 2015, is gunning to settle some unfinished business with Tyson Fury (25-0, 18 KOs).

According to Ustinov's manager, Vladimir "Krasivyy" Hryunov, his fighter is promising to "end the career" of Fury.

Fury, who himself has been inactive since shocking Wladimir Klitschko in November 2015, recently announced a ring return for May 13 in Leeds. Fury vacated his WBA, IBO, IBF titles last October to focus on his mental health issues.

Fury and Ustinov were scheduled to fight each other in July of 2014. Fury withdrew from the contest on the morning of the fight, after his uncle Hughie became ill and was rushed to the hospital. Fury's camp felt it was too risky to move forward with the contest, because Ustinov had come in as a late replacement.

There are some hurdles for Fury to overcome before a return is actually possible. Fury must first regain his license from the British Boxing Board of Control, and he must also get past his outstanding issue with UKAD, who claim the boxer tested positive for a banned substance in early 2015. In October the British Boxing Board of Control suspended his boxing licence “pending further investigation into anti-doping and medical issues.”

During his announced return on social media, Fury name-checked Frank Warren, BT Sport and BoxNation, the television platforms on which Warren promotes.

Warren has been influential in Hughie Fury, Tyson’s cousin, securing a shot at WBO heavyweight champion Joseph Parker on May 6 in New Zealand and would be the favourite to promote him in the event of his return.

At the moment there is no agreement with Warren to appear on May 13, when he is staging a bill at Leeds’ First Direct Arena.