Eddie Hearn, promoter for IBF, IBO, WBA, WBO heavyweight champion Anthony Joshua, says the 2021 unification with WBC champion Tyson Fury is unlikely to take place on UK soil.
The fight, which is arguably the biggest fight in the sport, will be pursued by groups in numerous countries.
Investment groups in Saudi Arabia and China are expected to make significant offers to secure the rights to host that event. Casinos in Las Vegas are expected to come to the table as well.
Venues in the UK will find it very difficult, at least financially, to secure that fight.
Joshua's last bout, a December rematch with Andy Ruiz, was scooped up for a tremendous amount of money by Saudi Arabia.
Fury will first take part in a trilogy fight with Deontay Wilder before the year is over, while Joshua is going to defend his world titles against mandatory challenger Kubrat Pulev.
If both champions win, their respective camps will work together to finalize a two-fight deal.
"If we can do the fight in the UK, fantastic, (but) we know Saudi Arabia would love to have this fight. We had a wonderful experience last time with the Andy Ruiz fight. We've had offers from China, we've had offers from around the world. This is the biggest fight in boxing, it doesn't get any bigger," Hearn said.
"There's not going to be any country that stages major events that won't want this fight. Everyone will talk about this fight taking place in the UK but it doesn't work like that.
"We have to go back to report the offers to these people's teams. It's a dangerous sport so let them make their money. It's a two-fight deal so one will take place in an alternative venue to the other fight. If we can do the fight in the UK, fantastic."