Kell Brook insists that he showed “a blueprint” of how to beat Gennadiy Golovkin, but admits his defeat had lasting ramifications.

Brook, then the IBF welterweight champion, moved up two divisions totalling 13lbs to challenge world middleweight champion Golovkin three years ago, but had his eye socket broken in a fifth-round defeat.

“He was at his peak which shows you the man I am – a welterweight jumping up to middleweight,” Brook told Sky Sports.

This weekend, A Big Drama Show is on it's way to Sky Sports 馃暫馃挜馃憫 @GGGBoxing looks to become a world champion once again when he takes on @SDerevyanchenko馃摵 2am, Sunday Morning (Saturday night) Sky Sports Action pic.twitter.com/zix7FuamTW

— Sky Sports Boxing (@SkySportsBoxing) October 3, 2019

Brook suffered a broken eye socket against GGG Brook suffered a broken eye socket against GGG Brook suffered a broken eye socket against GGG

“Golovkin was the most feared man on the planet at the time but Kell Brook just jumped straight in with him.

“Do I regret it now? Maybe, with what happened in the fight.

“But you can’t think like that, at the time. The opportunity was there for me to shock the world and I went for it. It didn’t go my way but I got good credit.

“I showed a blueprint of how to beat him. I showed everyone he can be beaten.

“And he has been beaten since. He isn’t the same fighter, I don’t believe.”

It was Golovkin’s 36th consecutive victory without defeat, and his 23rd stoppage in a row.

Tonight at 2am, live on Sky Sports Action, he will contest the vacant IBF middleweight title with Sergiy Derevyanchenko after losing his titles in a rematch with Saul ‘Canelo’ Alvarez last year.

Live Fight Night International

October 6, 2019, 2:00am

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GGG was 'at his peak' according to Brook GGG was 'at his peak' according to Brook GGG was ‘at his peak’ according to Brook

CRUNCH OF THE PUNCH!Those who have felt @GGGBoxing's power describe it like something unimaginable from a horror movie鉁岶eature: https://t.co/HZxwdrY1HK pic.twitter.com/o6DPgyHAz6

— Sky Sports Boxing (@SkySportsBoxing) October 4, 2019

Brook’s gym-mate, WBO super-middleweight champion Billy Joe Saunders, is a future option for Golovkin but believes this weekend’s fight will damage the Kazakh puncher.

“It’s a fight that, you could say, will not be skilful. It will be a scrap,” Saunders told Sky Sports.

“This fight is not about standing back technically, ping ping ping. This will be crash, bang, wallop.