AJ is set to clash with Oleksandr Usyk for the heavyweight world title belts after plans for a bout with Tyson Fury broke down but Hearn believes that his fighter is getting frustrated with bowing to the demands of the sport's governing bodies.
The promoter told The 3-Knockdown Rule podcast: "Usyk is a pound-for-pound top fighter, and he’s the undisputed cruiserweight champion, and AJ is continuously fighting these guys that he gets a letter about telling him 'You must do this.'
"And at some point, with the way he’s feeling at the moment, and the way I’m feeling at the moment, you don’t want to be told what to do. We understand [the sanctioning body] responsibilities. [Joshua] wants to fight for the undisputed world championship, and that is unfortunately an obligation of being a champion."
Hearn described Joshua as a "throwback fighter" who is prepared to take on tough opponents for the sake of the sport.
He said: "AJ believes that he punishes Usyk. But you have to understand that Anthony Joshua is a throwback fighter. Look at that resume. Where’s the easy nights? The easy fight? ‘Let’s fight Trevor Bryant and make $10 million and have an easy night.’ No. He’s a throwback fighter. And if he fights Oleksandr Usyk, which he probably will, look at the resume of this young man."