egis

According to his manager, Egis Klimas, Usyk swam 10km nonstop as preparation and was able to hold his breath for four minutes and 40 seconds.

Speaking on the MMA Hour, external, Fury took aim at Usyk's manager Egis Klimas who questioned the legitimacy of his injury.

"Egis, never call me a coward again," he said.

"You are all dossers. He's going to get knocked out. And you two are going to work for me slinging my bags," Fury told Usyk and his promoter, Alexander Krassyuk and manager, Egis Klimas.

But Egis Klimas, Usyk's manager, says he is still hopeful victory over Dubois will "lead to the biggest clash in the world" against Fury.