The British boxer is set to fight Jake Paul in an eight-bout fight which will be shown in real-time on Netflix.
Briton Joshua declared he will "stamp all over" the American and "break" his opponent as the combatants met personally to promote next month's boxing match.
Former two-time unified title holder Anthony Joshua faces YouTuber-turned-boxer Paul - in what is, theoretically, a massive disparity - at Miami venue on 19 December.
"I plan to break his face and hurt his body. I'm here to prove my superiority," the British boxer, 35, stated.
"I plan to overwhelm him. That's a fighter's mentality.
"I will genuinely try to cause him pain. That's my intention."
In spite of such comments, a composed Joshua and internet personality Jake Paul - usually famous for his showmanship - exchanged pleasantries and maintained decorum with each other.
Paul instead attacked former Joshua's opponent the Cameroonian fighter and called him "not serious" after Ngannou rejected a fight offer.
Joshua, at the same time, targeted UK rival Fury - and refused a £1m bet 'The Gypsy King' claims he will make on a Paul victory.
"Jake Paul is superior to Tyson Fury - he's present here," Joshua commented.
"I acknowledge that."
Despite declaring he will damage his opponent, Anthony Joshua refused to comment unfavorably about his rival's fighting skills.
"Jake is a serious fighter," he said.
Jake Paul - who first rose to fame on the Disney Channel - has mainly fought MMA fighters or faded names since turning professional.
He was defeated by Briton Fury in last year.
Nevertheless, the relative newcomer is still one of boxing's biggest commercial attractions, consistently making huge paydays.
The 28 year old predicted a stoppage in the fourth or fifth round and asserted he would prevent the much-anticipated match between Joshua and Fury, which is reportedly being planned for 2026.
"The next fight will be myself against Tyson Fury next year," Paul said.
As both boxers engaged in the traditional face-off, with their height and weight contrast on show, it highlighted just how improbable this complete situation is - and how amazing it is that the bout is truly happening.
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