Anthony Joshua and Oleksandr Usyk don't yet have a date set in stone for their rematch, with the situation now being complicated by an offer for Usyk to fight Tyson Fury.
A deal has been tabled from the Middle East which would see Usyk offered a huge purse to fight Fury for the undisputed heavyweight title, and Joshua paid a step aside fee.
But Hearn still believes that it's more likely fans will see Joshua face Usyk, while Fury takes on his mandatory challenger Dillian Whyte.
However, despite eyeing up an April date, he has told Mirror Fighting that it is not set in stone yet and could be moved to May given the situation.
"It'll be the end of April but it could even be early May," Hearn said. "It doesn't matter, April or May, those guys are only going to fight once or twice this year."
April 30 is already booked in for Katie Taylor's fight with Amanda Serrano at Madison Square Garden, with Hearn set to co-promote alongside Jake Paul.
And while there have been reports of an April 23 date for the Usyk rematch, with Joshua still looking for a new training set-up, it's possible he will want a later date.
He looks set to split with long-time coach Rob McCracken in favour of a new team, which will be announced shortly, although he is still not fully decided.
"He's still going through certain things," Hearn said of Joshua's search for a new trainer. "I feel that is really something that AJ should make people aware of.
"He will when camp starts, it's not really for me to say and I'm sure those guys will make an announcement when he starts camp."
The Matchroom Boxing boss also works with Whyte, who is currently locked in arbitration with the WBC over the massive 80-20 purse split they've mandated for his fight with Fury.
Do you want to see a rematch between Anthony Joshua and Oleksandr Usyk? Let us know your thoughts in the comments section below!
But he works closer with Joshua, and should a deal for the Usyk and Fury unification bout become clear, he will be willing to speak to the two-time champion about his options.
"I work closer with AJ than Dillian," Hearn continued. "There have been a lot of discussions already but until I'm ready to present something solid to those people then we can do that at any time.
"It's only if the time comes where it's something I consider good enough or serious enough, it's not just the money.
"Let's say we take the money and Joshua has a comeback fight with a new trainer, then we have a bigger fight vs the winner.
"OK, that's great, but how is that locked in? What's secure, what's not?
"It's all very complicated, and that's why it's taking such a long time and sometimes it will go quiet and then resurface."
