The British heavyweight became IBF world champion when Oleksandr Usyk vacated the belt by agreeing to a rematch against Tyson Fury but is seeking to legitimise his triumph with a win over Joshua next month.

Dubois told Sky Sports News: "I'm the underdog because I have to prove myself and beating him and winning this next fight will set me as a legit champion. I'm raring to go. This is everything. The big opportunity."

The fighter is looking to come on top against the former world champion by any means necessary but thinks that knocking his rival out would be the ultimate triumph.

Dubois said: "Win by any means necessary but a stoppage is definitely what I'm after, a good stoppage and a statement victory, that's what I'm all about.

"Very confident, very sure and happy and ready to do the business. I'm just raring to go.

"Every day I'm working towards it leaving no stone unturned. Just work, work, work and victory is definite."

Dubois' trainer Don Charles has been impressed with his charge as he prepares for the Wembley Stadium clash next month and thinks he can make up for the disappointment of losing in his previous world title shot against Usyk last year.

Charles said: "He's looking good. He's looking good and feeling good. He's enjoying his boxing.

"Tweaking every shot that he has in his arsenal. I've got a very happy camp and a very happy fighter."

The trainer added: "He is the current IBF heavyweight world champion.

"Every disappointment is also a blessing, the journey we've got planned for us, that's the way it was written. We're here.

"What happened, happened. Although it was disappointing in the beginning, it was a happy ending in the end that we're here today."