Anthony Joshua is determined to roar back at his doubters by beating Andy Ruiz in their rematch next month.

Joshua, 30, was the king of the heavyweight jungle before Andy Ruiz Jr stunned him on June 1 and snatched all of his belts.

The pair duel again in the Saudi Arabian desert on December 7 and critics of AJ have been popping up quicker than the 12,000 seater stadium getting rapidly erected to host the showdown.

The 6ft 6in hulk has cut salt from his diet and built a squad of short, quick-fisted sparring partners to mimic the 19st squat Mexican.
But he snarled when asked if he had changed anything about his physiological approach to the must-win rerun.

“We haven’t done anything differently mentally, I am a champion,”Joshua said at his Sheffield training camp.

“I walked into the gym and three years later I was Olympic champion.

“I have had one loss but I am not about to become a p***y overnight and not be able to fight.

“I can fight, that is it, I don’t need to reflect on that, I just need to win.”