Top Rank's CEO Bob Arum, who co-promotes WBC heavyweight champion Tyson Fury, is still in the process of finalizing the terms for an undisputed showdown with WBO, IBF, IBO, WBA champion Oleksandr Usyk,

As Arum explained to BoxingScene.com earlier this week, the biggest remaining obstacle is the venue.

At the moment, the frontrunner to land the fight is the Middle East.

The backup plan would be Wembley Stadium in London.

"I'm very optimistic the fight is going to happen," Arum told Sky Sports News. "Both fighters have agreed to do the fight, the question is the site and we're talking to the Middle East because allegedly they're going to come up with the biggest purse ever in boxing history.

"And if they do, that's where the fight is going to go because money is money. If they don't, both fighters will agree to do the fight this spring at Wembley... but the fight will happen in my opinion, certainly within the first four months of the year.

"Fighters want to do the best for themselves because a fighter's career, no matter how great he is, is limited and they want to make as much money as possible. So that's the only issue - where will the fight be held? I would believe in the next week that will be determined and then we'll have an official announcement of the date and site for the fight - but that fight is happening."

Fury saw action back in December, when he picked up a one-sided stoppage win over Derek Chisora.

Usyk entered the ring last August, when he retained his unified crown with a twelve round decision win in his rematch with Anthony Joshua.