As evidence of the moneymaking potential, the Los Angeles Times' Lance Pugmire reported in May that Finkel and Al Haymon were prepared to give Joshua $50 million guaranteed if he was willing to fight Wilder in the United States.
The victor of a Joshua-Wilder bout would be the first man to hold all four heavyweight titles - WBA, WBC, IBF and WBO - simultaneously.
The two camps have agreed to terms on a fight in the United Kingdom sometime this fall for less money than Wilder's initial offer, his co-manager and trainer Jay Deas said Monday night. Then they came back with a much, much, much smaller offer for Deontay, which would have been even less than Deontay would have made in the United States, and wanted him to still travel to the U.K. for the fight.
Hearn had claimed recently that Joshua could face Russian Alexander Povetkin, who is mandatory for his WBA title, in September before a Wilder clash in February. "It's up to them to choose". It's now in Joshua's court.
Another possible outlet is the Perform Group's DAZN sports streaming service, which is due to launch in the USA later this summer, with Hearn's recently agreed to eight-year, $1 billion deal to provide boxing content due to begin in September.
'Hopefully, we'll get an answer in the next day or two. "We want the fight next, we've signed the contract and we're ready to go".
The 28-year-old Joshua (21-0, 20 KOs) won a world title in 2016 and has made five defenses, including a 10th-round knockout of former longtime unified world champion Wladimir Klitschko in the consensus 2017 fight of the year and unifying three belts with the win against Parker on March 31.
Joshua told Independent.ie in March that he was keen to fight Wilder in his next fight and now it seems a deal has been done for what could be the richest fight in the sport's history.