Joshua’s IBF, WBA and WBO Heavyweight Championships are on the line at the Tottenham Hotspur Stadium on September 25 against Usyk, live on Sky Sports Box Office.
He remains hopeful of an undisputed title fight despite negotiations to meet WBC champion Tyson Fury that came to naught, as Fury was instead ordered to face Deontay Wilder in court.
Joshua exclusively explained to Sky Sports the breakdown of talks to fight Fury: “I don’t want to point fingers. I was definitely ready. We move forward.
“I have another challenger who is good, just as good.
“I have to be serious with him now.
“He’s definitely going to step up, he’s definitely going to take the fight. That’s what I need – serious people.
“I would have loved to box for the undisputed championship because it was a big fight for the public. We had everything in place.
“I have to move on and not continue to live. “
Fury and Wilder will collide in a trilogy fight on October 9, which means any potential meeting with Joshua for every belt in the division will have to wait until next year.
But Joshua is optimistic: “The most important fight for me is the next one but you have to have a vision of where you want to come from.
“I have to stay consistent and stay ready.
“Once I fight Usyk, who knows what’s going to happen next?”
“Will I fight Fury, Wilder, Dillian Whyte, Andy Ruiz, Luis Ortiz?” Who knows.
“I have to stay on track and ready for every fight, but have a long term plan.
“It’s about the belts, not the person. I don’t care who it is. I want to fight for the legacy. “
Joshua returns to the ring for the first time since December when he sent Kubrat Pulev in nine rounds.
His mandatory WBO challenger Usyk, the undefeated Ukrainian who won a gold alongside Joshua at the 2012 Olympics, recently beat Derek Chisora.