That was being drawn up on Tuesday and will be in front of Wilder by Friday at the latest and his response, having evidently agreed all terms, will determine if he is Joshua's next opponent, or if the Brit fights him next spring once Povetkin has been faced.
According to Pugmire, Wilder's and Joshua's respective teams were quibbling over the location of the fight, with Wilder's camp wanting it in the USA and Joshua's side preferring the UK.
Deontay Wilder will be sent a contract for the Anthony Joshua fight this week after the American "agreed" to a unification clash in the United Kingdom, says promoter Eddie Hearn.
"If they change their mind, the $50 million [against 50 percent of the event] we offered them [to come to the United States] is still on the table".
"The story is very simple and that is Deontay Wilder today, accepted the terms that Anthony Joshua's team gave us", Finkel told World Boxing News in an interview on Monday.
A fight with Wilder has always been Plan A for Joshua, but after lengthy talks with the WBC champion struggled to produce a definitive scenario, a deal had largely been concluded with Povetkin for September in London.
Deontay Wilder accepts terms for Anthony Joshua unification fight in U.K., awaits response
"Deontay has accepted his terms to fight in the UK".
Wilder's move is a significant step in getting arguably the biggest fight of the year on. And we said yes. On Monday night he posted: 'The $50M offer for Joshua to fight me next in the U.S. is still available to him if he wants it.
Although Finkel wouldn't specify how much money Wilder would earn, Hearn has made two previous offers of $12.5 million and $15 million.
Yet it appears a breakthrough has come in negotiations between IBF, WBA and WBO champion Joshua and WBC title holder Wilder.
"I think Wembley is where Anthony Joshua wants it to take place. It's up to them to choose".
A fight between Joshua and Wilder would see all major heavyweight world titles on the line. Not only does he hold a majority of the prominent belts, his victory in a war over onetime long reigning division king Wladimir Kltischko established the fighter as the man to beat throughout the fight world. Currently, Joshua is a -200 favorite and Wilder a +170 underdog.