Eddie Hearn, promoter of IBF, IBO, WBA heavyweight champion Anthony Joshua (20-0, 20 KOs), hopes to cut away any loose strings and finalize a deal in the coming days for a unification showdown with WBO king Joseph Parker (24-0, 18 KOs).
The two sides, after weeks of negotiations, finally reached an agreement on the revenue split a few days ago.
The contest is being targeted for a date of March 31, potentially at Cardiff's Principality Stadium - where Joshua drew 78,000 fans for his October stoppage win over Carlos Takam, who also lost a decision last year to Parker.
As previously noted, Parker stands to make a lot of money if he defeats Joshua.
At the moment, the revenue split has Parker receiving between 30 to 35%, and Joshua getting 65 to 70% of the financial pot.
But if Parker wins, the rematch clause would call for him to receive 55% of the overall revenue.
There is talk that Parker is going to make as much as $12 million in the Joshua encounter, at least according to reports in New Zealand. With a win over Joshua, and 55% of the revenue split, the rematch would bring him quite a bit more.
"I won't talk about the deal but what I will say is that a rematch isn't for [Joshua's] protection, it's a carrot to show [Parker] what's possible - it's an incentive to get him to take the fight," Hearn said to Herald on Sunday.
"If he wins, he's going to make an absolute fortune in the rematch. If it's a good fight and Joe loses, we'll do it again no problems. If he beats AJ, the first fight he will want after is a rematch because it's the biggest fight in boxing. If he does win he's also going to be the biggest star in the sport."
David Higgins, who promotes Parker, is expected to fly out to London next week to meet with Hearn in order to finalize the deal.
Showtime would televise the fight in the United States, with Sky Sports Box Office carrying the action in the UK.