Heavyweight contender Filip Hrgovic, who is the IBF’s mandatory challenger, is ready to face Oleksandr Usyk, the unified IBF, WBO, IBO and WBA champion.

Hrgovic is among three mandatory challengers who are gunning for a crack at Usyk.

First up, however, is likely the WBA's mandatory challenger, which is "regular" champion Daniel Dubois.

Usyk was in serious negotiations to collide with WBC champion Tyson Fury, but on Wednesday their discussions fell apart after failing to reach an agreement on the monetary terms with respect to the rematch clause.

Kalle Sauerland, the co-promoter of Hrgovic, says his boxer is ready to go if Usyk plans to move ahead with the mandatory route.

"Usyk, Hrgovic is waiting for you, the rest of the belts, he wants them all," Sauerland told Sky Sports. "He's not the type to beat round the bush, Filip. He's been waiting a long time for this shot."

Hrgovic won an IBF eliminator last year, when he went through fire to overcome Zhilei Zhang, who ironically is facing the WBO's mandatory challenger, Joe Joyce, next month.

"After the whole of the IBF top 15 didn't want to fight him, hats off to Zhang," Sauerland added. "He's next in line to fight Usyk [for the IBF title].

"Who doesn't think that Hrgovic would give any heavyweight a right run for his money? "I'm going back to the fact that he stopped David Haye from taking part in the David Haye-Tyson Fury fight. He was the one who gave the left hook in sparring that took him out of that fight, unfortunately.

"There's the leaked sparring with Deontay Wilder. It's a right back and forth. It's pay-per-view boxing in sparring. For people who know their boxing Hrgovic is obviously a massive, massive fight at heavyweight."

Sauerland would not speculate on the situation where Dubois is the first boxer in the sanctioning body rotation to get his shot.

Dubois' promoter, Frank Warren, is confident his man will get the first mandatory shot at Usyk.

"I can't speculate too much on that but we know that Filip Hrgovic is the IBF [mandatory], that's then down to the governing bodies and we lobby for our guy. It's a fight that I think a lot of people want to see," Sauerland said.