Former world champion Kell Brook is still haunted by his knockout loss at the hands of Errol Spence, who holds the IBF, WBC welterweight titles.

Brook, who at the time held the IBF strap at 147-pounds, was making a mandatory defense against Spence in May of 2017 in Sheffield.

Brook was down in the tenth and then again in the eleventh for the full count. Spence fractured Brook's orbital bone in the fight. At the time of the stoppage, Spence was winning on all three official cards with tallies of 95-94, 96-93 and 97-92.

Brook claims to have depleted his body in making the weight, after his previous body against Gennady Golovkin took place at the middleweight limit of 160-pounds.

Following the back to back defeats, Brook moved up to the junior middleweight division. He returned to the ring earlier this month, when he knocked out Mark DeLuca in seven rounds.

Brook believes that a rematch with Spence, at 154-pounds, would have a very different outcome from the first contest - because he would be injury free and his body would fresher at the junior middleweight limit.

"I know that I was beating him before, I'd get all the positives from it. That haunts me, the first fight. It haunts me and I would love the rematch with Errol Spence," Brook told Sky Sports.

"What I would do differently is I would be 100 percent in there. There won't be 60 percent. I'll be 100 percent. It's infectious the confidence what I'd bring with that. I'd feel that I'd be at the weight comfortably, I can go 12 rounds at a hard pace.

"From round six, I would be able to be strong. You know that if you're not prepared properly, you can only get so much out. I would get everything out and I'd be victorious."