The two British boxers are set to meet in the ring at Wembley Stadium.
Usyk, who relinquished the IBF title for Dubois, is confident that Joshua will prevail against the 27-year-old contender.
He shared with Sky Sports: “I think it’s AJ. I respect both of these guys, but I predict Anthony.
“It’s good. IBF did not take my belt, I gave my belt to Anthony Joshua and Dubois.
“Because for me, it’s important that my sport of boxing develops.