The 30 year-old moves up 13 pounds from his position as champion at 147 pounds but it confident he can make an impression in the fight and has already played a knockout over in his mind.
“It’s going to come down to the mind this fight,” Brook told Sky Sports News HQ.
“It’s not about who’s the strongest. It’s about who thinks the best. You’ve got a real drama and a real fight on your hands.
“But I’m not interested in what he’s going to be doing. I’m more interested in what I’m going to be doing. Fighters who fight Golovkin have lost before they get in the ring when they hear that he’s a big puncher.
“I’ve heard about his power and I’ve got respect for him but I’m going to concentrate on what I’m going to do. I’ll do what I want when I want as often as I want in this fight.
“I’m always looking to knock my opponents out. I visualized the knockout already against this guy. My record speaks for itself and I like to win.”
Asked what weaknesses ‘GGG’ possesses, Brook added: “It’s very hard to find weaknesses in him but he does get hit. He does get hit with shots and I’m very accurate.
“I hit harder at these higher weights. If he gets hit, he’ll get beat,” he said.