WBC heavyweight champion Deontay Wilder believes that he knows the "secret" reason that led to Anthony Joshua's shocking loss to Andy Ruiz on June 1 at Madison Square Garden in New York City.

Joshua was dropped four times and stopped in the seventh round, losing his WBO, WBA, IBF, IBO world titles to Ruiz.

The rematch is scheduled for December 7th in Saudi Arabia.

Both Wilder and Ruiz are handled by Al Haymon's Premier Boxing Champions. Wilder is scheduled to face Luis Ortiz in a rematch on November 23 at the MGM Grand in Las Vegas. Should both Wilder and Ruiz win their upcoming bouts, a full division unification could be in play for 2020.

Wilder has made it no secret that he expects Ruiz to once again come out on top when the rematch takes place.

"I really don't believe [Joshua] is ready for that. I'm one of the people that he has to prove wrong," Wilder told Sky Sports.

"Many people have doubted me from the beginning and still do so. But I'm one of the people he has to prove wrong. I understand body language, I am very smart when it comes to [these things]. What his body said in that ring showed me everything that I need to see. Only the fighter would know within himself.

"The secret is still to be told. And that's OK, because you want to keep people guessing. Was it this? Or was it that? That's why the second fight is bigger. People don't know what to think.

"People will finally see what it really was. If he's not right, and people are saying one thing but he does another, then people will have their own perception of what they think about him afterwards. People say 'if he loses, it's over'. There is more pressure on him. When I talk about his situation I feel drained. Trust me, I have a sixth sense."