There is a lot of sorting out to do for this fight, but great news that in principle he seems to be on board for the idea of coming to the United Kingdom for the fight.
So the heavyweight division appears to be getting its biggest fight.
After negotiations seemingly stalled for the bout, which would decide the first undisputed heavyweight champion since Lennox Lewis, it was expected that both Joshua and Wilder would go down the route of mandatory defences in the autumn.
Wilder had initially attempted to lure Joshua to the U.S. with a $50m offer.
Anthony Joshua and Joseph Parker embrace after their fight in Cardiff. "Hopefully, we'll get an answer in the next couple days", Finkel said.
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The Lazio man, who is set to play a key role for Serbia at the World Cup , would be a significant upgrade on the Belgian. But, Manchester United are not alone in the race to sign the 23-year-old , with Real Madrid now emerging as a suitor.
If the Wilder fight is next up for Joshua, then the original plan of September 15 is now highly unlikely due to the lack of time involved, as well as the United States television clash with Canelo Alvarez's return from a drug's ban. "We wanted a percentage, but we didn't think we could get it done in a quick time frame, so we said let's take what they've offered us".
Another possible outlet is the Perform Group's DAZN sports streaming service, which is due to launch in the US later this summer, with Hearn's recently agreed to eight-year, $1 billion deal to provide boxing content due to begin in September. A Joshua-Wilder fight on the service would raise its now nonexistent American profile, but it would also limit the USA revenue for the bout.
Joshua, 28, won his first world title in 2016 and has made five defenses, taking his record to 21-0 with 20 knockouts.
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. Currently, Joshua is a -200 favorite and Wilder a +170 underdog.
Hearn told Sky Sports News it is the only way to find out if the WBC titleholder Wilder is serious about fighting Joshua even though reports out of the United States on Monday suggested he had accepted a two fight deal with the 2012 Olympic champion and now holder of the WBA, WBO and IBF belts.