Oleksandr Usyk will defend his IBF, IBO, WBO and WBA heavyweight titles against Britain's Daniel Dubois next month.
The match will take place at the Tarczynski Arena in Wroclaw, Poland, on August 26.
Usyk was expected to fight WBC world heavyweight champion Tyson Fury in a unification fight but negotiations fell through in March.
Dubois, 25, is the WBA (regular) heavyweight belt holder and mandatory challenger.
Former undisputed cruiserweight champion Usyk snatched the titles off Anthony Joshua in London in September 2021 and won the rematch in August last year in Saudi Arabia.
Dubois will be Usyk's second defence of his world heavyweight belts with the match-up announced on Twitter by Frank Warren's Queensbury Promotions.
Usyk, whose scheduled showdown with Tyson Fury at Wembley fell through due to contractual disputes, said simply on Instagram: "See you 26 August".
Londoner Dubois, nicknamed 'Dynamite', has won 19 of his 20 fights since turning professional in 2017, 18 by knockout, with one defeat, against fellow British heavyweight Joe Joyce in 2020.
Dubois suffered a fractured orbital bone and nerve damage to his left eye when stopped in the 10th round by Joyce, but has beaten four opponents since.
-
Anthony Joshua looks angry after losing against Oleksandr Usyk in their world heavyweight bout on a split decision at the King Abdullah Sport City Stadium in Jeddah, Saudi Arabia, in August. Getty -
Oleksandr Usyk after retaining his world heavyweight titles in a split decision against Anthony Joshua at the King Abdullah Sport City Stadium in Jeddah, Saudi Arabia. PA -
Oleksandr Usyk celebrates winning his fight against Anthony Joshua. Action Images -
Oleksandr Usyk after winning in Jeddah. PA -
Oleksandr Usyk reacts after his victory. PA -
Anthony Joshua speaks to the crowd following his defeat against Oleksandr Usyk in Jeddah. Getty -
Anthony Joshua and Oleksandr Usyk touch gloves at the end of the fight. PA -
Oleksandr Usyk celebrates with his belts and his team. Getty -
Oleksandr Usyk celebrates after retaining his world heavyweight titles. PA -
Oleksandr Usyk celebrates with the flag of Ukraine. Getty -
Oleksandr Usyk after winning his fight against Anthony Joshua. Action Images -
Oleksandr Usyk after winning his fight against Anthony Joshua. Action Images -
Anthony Joshua on the front foot against Oleksandr Usyk. PA -
Anthony Joshua and Oleksandr Usyk trade punches. Getty -
Anthony Joshua evades a right. Getty -
Oleksandr Usyk after receiving a low blow. Action Images -
Oleksandr Usyk lands a right on Anthony Joshua. Getty -
Anthony Joshua and Oleksandr Usyk in action at the King Abdullah Sport City Stadium in Jeddah. PA -
The ring is cleaned between rounds. Reuters -
Anthony Joshua evades a punch from Oleksandr Usyk. Getty -
Anthony Joshua with a body shot. Action Images -
Oleksandr Usyk throws a right. Action Images -
Oleksandr Usyk in action against Anthony Joshua. Action Images -
Anthony Joshua made a low-key entrance at King Abdullah Sports City Arena in Jeddah. Getty -
Anthony Joshua and promoter Eddie Hearn before the fight. PA
