Joshua, the WBA, WBO and IBF heavyweight title holder, was due to have a showdown between British heavyweights and Tyson Fury this summer, but a court ruling in the United States derailed a draft fight in Saudi Arabia on August 14.
An arbitration hearing upheld a claim by fellow heavyweight Deontay Wilder that he contractually owed a third fight with champion WBC Fury.
This 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. The victory of the two Britons would fuel more discussions about an undisputed potential fight.
“Joshua v Usyk announcement, I don’t mean two weeks because you’re sick of me saying that,” Hearn said on live Instagram.
“September 25 is the date. “
With the prospect of an all-British heavyweight contest for now, Joshua focused on an expected meeting with Ukrainian boxer Usyk.
The Tottenham Hotspur Stadium is the likely location of the fight.
Watch Vasiliy Lomachenko vs. Masayoshi Nakatani from 3 a.m. on Sunday, live on Sky Sports.