Anthony Joshua will face Oleksandr Usyk on September 25, Eddie Hearn has confirmed.
Joshua, the WBA, WBO and IBF heavyweight title-holder, was due to have an all-British heavyweight showdown with Tyson Fury this summer but a legal ruling in the United States derailed a proposed fight in Saudi Arabia on August 14.
An arbitration hearing upheld a claim from fellow heavyweight Deontay Wilder that he was contractually owed a third fight with WBC champion Fury.
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It means Joshua will now face Usyk in September, while Fury will take on Wilder to complete a trilogy of fights between the two on July 24. Victory for both Britons would fuel more talk of a potential undisputed bout.
"Joshua v Usyk announcement, don't want to say two weeks as you guys are bored of me saying that," Hearn said on Instagram live.
"September 25 is the date."
With the prospect of an all-British heavyweight contest over for now, Joshua has turned his focus to an expected meeting with Ukrainian boxer Usyk.
The Tottenham Hotspur Stadium is the likely venue for the bout.
Watch Vasiliy Lomachenko against Masayoshi Nakatani from 3am on Sunday, live on Sky Sports.