Kell Brook says that Errol Spence Jr has “bitten off more than he can chew” after the pair’s heated first press conference.

Brook is heading back down to welterweight to defend his IBF belt against unbeaten Spence Jr at Bramall Lane on May 27, live on Sky Sports Box Office.

The champion jumped two divisions to take on Gennady Golovkin last time out, a typically bold performance finishing when his corner pulled him out in the fifth.

Indeed, even Spence Jr acknowledged the merit of Brook’s display that night, yet that was about the only compliment offered by the American, who accused his rival of “living off two good rounds with GGG”.

Brook reacted on Sky Sports News HQ after the press conference, saying: “He sounds very confident.”

“He’s American and they’ve given him a lot of hype. He has been looking very good in fights, but he’s bitten off more than he can chew when he steps in with me.”

“He’s got some skills, a good amateur pedigree and he looks the part, but he’s come to the final hurdle and that’s me.”

“I’m champion of the world, and it’s a dream come true fighting at Bramall Lane. I’m going to get so much energy from the fans, and I’m on point with the weight.”

Brook was generally expected to move up to light-middleweight in the wake of the Golovkin fight and said getting back down to 147lbs will make him “grumpy”.

In any case, the pride in defending a world title it took 33 fights to achieve proved a bigger motivation than avoiding weeks of hard work in the gym.

“My team wanted me to move up 154,” he stated, “but it’s taken me so long to get a world title with my injuries and the politics in boxing.”

“I eventually got it, and just to give it up is not in my nature. It made me dig my heels in even more, and I’m determined to defend what’s rightfully mine.”