Oleksandr Usyk has announced that he will abandon his IBF championship belt just weeks after becoming undisputed world heavyweight champion.

The Ukrainian, 37, became the first heavyweight to win the IBF, WBO, WBA, and WBC championships after defeating Tyson Fury on a split decision in Saudi Arabia last month.

Usyk is no longer in a position to defend the IBF title against interim champion and mandatory challenger Daniel Dubois because he is now scheduled to fight Britain’s Fury again.

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That means Dubois’ upcoming all-British battle against Anthony Joshua at Wembley in September might suddenly be for the vacant belt.

Usyk said in a video posted on social media: “Anthony and Daniel, listen.

” I know the IBF title is important to you. It is my present to you on 21 September.”

Prior to Usyk, Britain’s Lennox Lewis was the last heavyweight to unify all three major belts in 1999.