Kell Brook aims for speed & power against Gennady Golovkin

Undisputed world middleweight champion Golovkin (left) is unbeaten and has 32 knockouts from his 35 fights

Kell Brook says he can maintain his speed and bring power to the ring when he steps up to middleweight to fight Gennady Golovkin on 10 September.

Brook, 30, is the IBF welterweight champion and is moving up two weight divisions to take on the Kazakh boxer.

"I'm going to bring the speed up to the middleweight division," Brook said.

"I'm going to bring big power as well. I'm ready for this fight. To be the best you've got to beat the best - it doesn't get any bigger than GGG."

Brook says the bout in London will be "the biggest fight in world boxing" and that he has been "training like a wild horse".

The Briton is unbeaten in 36 fights, while undisputed world middleweight champion Golovkin, 34, has won all 35 of his professional bouts.

"I'm going to be so alive for that night," Brook said.

"No-one has ever got the best out of me. I want to test myself. I know we are going to see the best in me. I'm excited to see what I can do."

He added: "I'm the best welterweight on the planet and no-one seems to want to fight me. GGG is the same in the middleweight division."