The British boxer is set to fight Jake Paul in an eight-round fight which will be shown live on the streaming platform.
Briton Joshua stated he will "dominate completely" the American and "defeat" the American as the combatants came face-to-face to promote the upcoming bout.
Former two time world heavyweight champion Joshua meets YouTuber-turned-boxer Jake Paul - in what is, by the numbers, a huge disparity - at Miami arena on 19 December.
"I'm going to break his face and damage his physique. I'm here to prove I'm the better fighter," Joshua, 35 years old, declared.
"I will dominate him completely. That's a fighter's mentality.
"I intend to seriously aim to injure him. That's what I want to do."
In spite of those words, a calm Joshua and social media star Jake Paul - typically known for his showmanship - exchanged pleasantries and kept it respectful with each other.
Jake Paul instead criticized ex Joshua's rival the Cameroonian fighter and called him "ridiculous" after the Cameroonian rejected a fight offer.
Joshua, at the same time, criticized British opponent Fury - and declined a £1m bet 'The Gypsy King' states he will put on a victory for Paul.
"Jake Paul is better than Fury - he's actually sitting here," Joshua commented.
"I give him credit for that."
Despite declaring he will punish Paul, Joshua chose not to speak negatively about his rival's fighting skills.
"Jake Paul is a serious fighter," he remarked.
Paul - who originally gained popularity on the Disney Channel - has primarily boxed MMA fighters or declining opponents since becoming pro.
He lost to Briton Fury in last year.
Still, the novice is still one of boxing's biggest money-making draws, frequently receiving massive paydays.
The 28 year old forecast a stoppage in round four or five and stated he would prevent the much-anticipated Fury-Joshua bout, which is reportedly under discussion for two years from now.
"It will be my match with Fury next year," Jake Paul declared.
As the two fighters participated in the traditional confrontation, with their physical disparity on show, it highlighted just how unlikely this whole event is - and how remarkable it is that the match is really happening.
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