The Ukrainian's stature means he is considered by many to be the underdog for the heavyweight unification bout later this month but he claims that it could actually work in his favour on the night in Saudi Arabia.
Usyk told Ring Magazine: "To win this, I don't need to be heavy, I need to be fast, and quick. You never see a fat wolf in the forest."
Fury is known for his mind games in the lead-up to big fights but Usyk will not be paying attention to any of his rival's verbal trickery.
The world champion said: "I really don't think about Tyson Fury. I don't look at the way he acts and what he does. Most of his opponents fell for it. I don't.
"For me, I focus on how I am, and how I prepare for when I go into the ring. Me and my trainer have watched his fights. We are preparing for everything. We have to watch what he is doing."
Usyk continued: "I don't care about what Fury thinks about me.
"He can underestimate. He can overestimate me. I don't care. I have my plans for him. I have advantages over him that he does not know about."
Usyk's manager Egis Klimas previously suggested that the bout with Fury would be the hardest test of the Ukrainian's successful career in the ring.
Klimas told the World Boxing Council: "We've been working to get this fight for a long, long time and finally we did it. Definitely it isn't going to be an easy fight. It will probably be the hardest fight of Oleksandr's career. He's confident, but simultaneously he knows full well that there's going to be a lot of work to do. He's a hard worker, a good athlete and a very good fighter."