The British boxer is set to fight Jake Paul in an eight-round match which will be broadcast in real-time on the streaming platform.
Briton Anthony Joshua said he will "overwhelm entirely" the American and "break" his opponent as the two fighters met personally to promote the upcoming bout.
Former twice world boxing king Joshua faces social media star turned fighter Paul - in what is, theoretically, a huge uneven pairing - at Miami venue on 19 December.
"I will injure his face and hurt his body. I'm here to prove my superiority," the British boxer, 35, said.
"I'll stamp all over him. That's how fighters think.
"I will seriously aim to cause him pain. That's my goal."
Despite those words, a calm Joshua and social media star Paul - normally recognized for his showmanship - were respectful and remained civil with each other.
Paul instead targeted former Joshua opponent Francis Ngannou and described him as "ridiculous" after Ngannou declined a bout proposal.
Anthony Joshua, meanwhile, took aim at UK opponent Fury - and declined a million-pound wager 'Tyson Fury' says he will place on a Paul win.
"Jake Paul is superior to Fury - he showed up," the boxer commented.
"I respect him for that."
Despite declaring he will hurt Jake Paul, Anthony Joshua chose not to talk badly about his opponent's fighting skills.
"Jake is a serious fighter," he remarked.
Jake Paul - who first rose to fame on the Disney Channel - has primarily fought MMA fighters or declining opponents since entering professional boxing.
He lost to British fighter Tommy Fury in last year.
However, the inexperienced fighter continues to be one of the sport's largest money-making draws, consistently making huge earnings.
The 28-year-old predicted a knockout win in rounds four or five and asserted he would derail the highly-expected match between Joshua and Fury, which is reportedly under discussion for 2026.
"The next fight will be my match with Fury in the coming year," Jake Paul stated.
As both boxers engaged in the traditional confrontation, with their size difference clearly visible, it drove home just how unlikely this whole event is - and how astonishing it is that the match is actually happening.
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