IBF, IBO, WBA, WBO heavyweight champion Anthony Joshua has no concern about Oleksandr Usyk trying to make their upcoming fight a 'boxing match.'

Joshua will defend his belts against Usyk on Saturday night, before a packed crowd at Tottenham Hotspur Stadium.

Uysk, a former undisputed cruiserweight world champion, is regarded as the better boxer - with Joshua being the bigger and stronger man.

Both men captured Olympic gold medals at the 2012 London games.

"You always aim to prepare for a 12-round fight but hope to cut it short - you aim to knock people out," Joshua told Sky Sports.

"You learn where their strengths are, where their weaknesses are. He has good stamina. So we work around, not just losing weight, but rounds of sparring and rounds on the heavy bag to generate good stamina. We build boxing memory in our muscles so they don't get fatigued when they are exploding on the opponent's body and face."

While most back Joshua to win inside the distance as the likely outcome for him, but Usyk is backed by many to win a twelve round decision if it goes the distance.

Jsohua believes he can win either way - by knockout or by outboxing Uysk to a decision win.

"I can outbox him, of course I can. And I can out-strength him. You have to have a bit of aggression, boxing skill, head movement. There is not just one factor that determines a fight," Joshua said.

"Obviously we have our go-to - our strength. I will use my strengths. But it's called a boxing match for a reason. I love the sweet science. I will display my boxing skills, but I won't make it too complicated in there."