Whyte vs Povetkin were set to meet in a heavyweight showdown in Manchester on May 2, with the card also due to feature Katie Taylor’s world title defence against Amanda Serrano.
But, with the coronavirus pandemic completely wiping out the sporting calendar and the UK currently on lockdown, Hearn has been forced to reschedule the fight along with a host of other Matchroom productions.
The British Boxing Board of Control has suspended all events under its jurisdiction until the end of April and, speaking on talkSPORT’s Sports Breakfast on Monday, Hearn said: “We will make an official announcement today but basically, yes [Whyte vs Povetkin is off].
“Every sport is looking at their calendar but nobody knows when [it will resume].
“We all hope we can return to some kind of boxing in June, whether that is behind closed doors at first, whether that is back in small hall shows, and then we hope we can get to the bigger stuff by the end of June, early July. But we are completely guessing.”
Hearn also revealed July 25 is the more realistic date for Joshua’s next fight – but accepts even that may be too soon for boxing to return.
Joshua, the WBA, WBO and IBF world heavyweight champion, is due to defend his titles against Kubrat Pulev at the Tottenham Hotspur Stadium on June 20.
“We have looked at alternative dates for everything without knowing anything concrete,” said Hearn.
“We have ongoing conversations with Tottenham to say that if the Premier League extends and does get played in June then we’ll be pushed back.
“We do have a date of July 25 held at Spurs as well, which is more realistic. It is five weeks after June 20. But we haven’t gone on sale with that, we haven’t made an official announcement in terms of seat details and on-sale dates, so we have got less pressure on that.
“There is more pressure for Anthony to fight twice this year.
“I know there is a bigger picture going on but everybody in sport, eveybody in business right now, needs to be working on a solution, the outcome, what happens when we get through this because it is going to be a horrifically messy time for all businesses, all sports, everyhing, when we do come out the other side.
“The world won’t be the same again and, in a lot of cases, we will have to start from scratch.”