A unification fight would take precedence over Parker's challenge, but, should Joshua remain successful, the way could be clear for Parker to then fight for not only the IBF title, but potentially also the WBO and WBA belts. Given Hearn is likely to keep the 26-year-old Joshua active, it wouldn't be out of the question to see him fight Parker in January or February 2017.
Hearn sees Parker as a genuine threat, but also a potential money maker for himself and Joshua.
The path would not be as straightforward should Fury win, because the man who refers to himself as the Gypsy King is as unorthodox out of the ring as he is in it, but the good news for Parker is that Fury rates him and is prepared to fight him.
Joshua's promoter Hearn said recently: "My plan is to fight on July 9 or wherever, then to go in mid-early November and then look at our mandatory. Now, the unification would allow us to avoid the mandatory if it wasn't the right guy, ie. commercially great for us. But again, Joseph Parker could be a great fight for Joshua, that could be a big fight.
"It's like this massive jigsaw at the moment but you can't really wait on these fights because sometimes they just don't happen. But with Fury, all of a sudden, maybe November is the time to make the fight."
Hearn, like Joshua, suddenly hot property with the British media, added: "I think Tyson Fury's an easy fight for Joshua. I see no problems in that fight at all. I think he knocks him out convincingly. I think he does exactly the same to him as what he did to [Charles] Martin. He's too slow. People say Klitschko couldn't get him out, Klitschko never had the no-fear policy and the speed and the power."
The outspoken Fury, meanwhile, has said he would fight "anyone at any time. I'll fight [WBC champion Deontay] Wilder, I'll fight Joshua, I'll fight Klitschko, whoever, next. Parker, Joseph Parker, I really rate that guy and I'd like to share a ring with him."