Wilder, 33, was lucky to hold onto his WBC heavyweight world title after he drew against Tyson Fury, 30, at the beginning of the month.
Since that epic fight, unified champion Joshua has made it no secret he wants to fight Wilder in an undisputed heavyweight world title showdown.
Speaking to Sky Sports Joshua, 29, who owns the WBA, IBF and WBO world crowns, challenged Wilder to show the world who the No 1 heavyweight is.
Joshua said: “I want to become undisputed, who’s got the belt? Wilder, that’s who I want to fight and hopefully that happens.
“If not then you have to have option B and C in place as well – so my message is that’s who I would like to go for.
“This is your chance to prove to the world that you’re the best and once you do prove if you do get over this hurdle, you have the keys to the city.
“Don’t look at it for what it is now, prove to yourself and prove to your fans that you're the best in the world.
“If you can do that, you’re a boxing god and you have the keys to the city to dictate and determine whatever you want.”
Joshua’s promoter, Eddie Hearn, was hit with criticism for failing to seal a deal for Joshua and Wilder to fight, with Fury instead challenging The Bronze Bomber.
After the Wilder negotiations broke down, Joshua would instead fight Alexander Povetkin in September as he knocked out the Russian after seven rounds.
However, Hearn confirmed he is in communication with Wilder’s team to make the long awaited fight happen – but the promoter is aware the Fury rematch offers a problem.
Hearn said: "We're talking, but I don't know what they are going to decide to do.
“(Wilder’s) always said 'one face, one king,' that's been his moniker. You can't say that and not even try and make the fight.
"The (Fury) rematch is a big fight, but it's about legacy and what you actually want.
"It's really what matters to them. What matters to us, is for him to be undisputed heavyweight champion of the world. If that matters to them, then these talks will get serious."
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