The British boxer will face Jake Paul in an eight-bout match which will be shown live on the streaming platform.
Briton Joshua said he will "overwhelm entirely" Jake Paul and "overpower" his opponent as the two fighters met personally to promote the upcoming bout.
Former two time unified boxing king Anthony Joshua battles YouTuber-turned-boxer Paul - in what is, by the numbers, a huge uneven pairing - at Miami arena on 19 December.
Fighter's Attitude
"I will break his face and hurt his body. I'm here to prove I'm the better fighter," Joshua, 35 years old, declared.
"I'll stamp all over him. That's a fighter's mentality.
"I'm going to genuinely try to injure him. That's what I want to do."
Respectful Interaction
In spite of those words, a calm Joshua and internet personality Paul - typically famous for his showmanship - were respectful and maintained decorum with each other.
Paul rather targeted ex Joshua's rival Francis Ngannou and called him "not serious" after Ngannou declined a match opportunity.
Taking Aim at Fury
Anthony Joshua, at the same time, criticized UK opponent Fury - and rejected a large bet 'The Gypsy King' claims he will make on a victory for Paul.
"[Paul] outshines Tyson Fury - he's actually sitting here," the boxer said.
"I give him credit for that."
Legitimate Opponent
In spite of stating he plans to hurt Jake Paul, Joshua declined to speak negatively about his rival's boxing ability.
"Jake Paul is a legitimate boxer," he remarked.
Paul's History
Jake Paul - who first rose to fame on the television network - has primarily fought mixed martial artists or past-their-prime fighters since turning professional.
He lost to Briton Fury in last year.
Commercial Success
Nevertheless, the inexperienced fighter remains one of the sport's largest commercial attractions, regularly earning substantial paydays.
Prediction and Confidence
The 28-year-old predicted a stoppage in the fourth or fifth round and stated he would derail the highly-expected Fury-Joshua bout, which is allegedly under discussion for two years from now.
"It's going to be me versus Tyson Fury in the coming year," Jake Paul declared.
Size Difference
As the two fighters engaged in the usual face-off, with their height and weight contrast on show, it highlighted just how surprising this whole event is - and how amazing it is that the fight is truly going ahead.