Dillian Whyte and Tyson Fury offered April 13 fight against Anthony Joshua

Unified heavyweight world titleholder Anthony Joshua could announce his next opponent by the end of the week.

Joshua is set to return either on April 13 at Wembley Stadium in London or at a later date in May or June at Madison Square Garden in New York City.

The Joshua sweepstakes is by most accounts down to three fighters, and according to Joshua's promoter Eddie Hearn, that is about accurate.

"I think we'll decide this week, but whether we let you know is another story," Hearn told Sky Sports News. "There's three guys that are interested in the fight - and that's Fury, Whyte and Jarrell Miller. If it's Miller, it will be at Madison Square Garden in New York. If it's the other guys, it's going to be at Wembley.

Hearn added that Joshua is already in training camp preparing for whoever he has to face.

"Everyone is stopping me in the street saying 'what's next?' It's frustrating, because some want the fight, and some don't want the fight. I feel as though he's putting together some great offers for these guys and we need to decide soon," Hearn said.

"Joshua is already in camp. He keeps himself in training all the time. He's waiting on the news. I'm going to see him on Friday night, sit down with him and go through exactly where we're at. We'll be making some big decisions this weekend."

WBC titlist Deontay Wilder must face Fury in a mandatory rematch before he takes on Joshua. Sources have informed FightNights.com that the rematch could take place in May or June. But Fury could theoretically abandon a Wilder rematch for an opportunity at his domestic rival.

Although Whyte is the frontrunner to face Joshua in April, the WBC silver champion was insulted by their initial offer for a rematch. Whyte was reportedly offered $5 million. If plan A fails, plan B is Jarrell Miller. However, Hearn has yet to present an official offer to Miller.

"There's been no official offer to Jarrell Miller yet; there's been offers to all the other guys," he said. "Some have been improved, some we're stuck at, some are open to negotiations. The hard thing is the lack of feedback. It's all very well saying no, but tell us what you don't like about it.

"Deontay Wilder, total radio silence. I don't think he even wants to touch this fight. Fury I believe wants the fight, and same with Dillian, but we have to get the feedback to say 'we don't like this offer, we want this, or we want that,' and no-one's really doing that - which is worrying - to tell you that they actually want the fight. No one is pushing. We're the ones continually making offers, improving offers, making phone calls, text messages and emails. End of this weekend, we've really got to start pulling the trigger."