The 30 year-old, who lost out to Gennady Golovkin in five rounds last September, could now head back down to welterweight where Khan recently told WBN he would be willing to agree a fight.
Brook v Khan is seen as one of the biggest fights to make on UK soil over the past few years and could become a reality in the spring or summer if both sides finally sit down and get serious with their numbers.
“He talks about all these fights like that Eubank kid and the way he talked about Golovkin,” Brook told Sky Sports.
“He asked me if I really wanted to fight him and I said yes and I was going to step up and do it. Too many people just talk about these fights but a few of them step up to the plate – and I was one of them.
“It’s come ’round full circle now. My status is higher than his when it comes to boxing so, if he wants it, he’s going to have to step up to the plate.”
Both boxers are on the back of disappointing moves up in weight, so the only delay could be the want by their respective promoters to have a warm up before sharing the ring later in 2017.
Wembley Stadium has been mentioned as the venue, but with Anthony Joshua v Wladimir Klitschko being eyed for the famous ground in the spring, Brook v Khan would either have to land on the undercard or take place at an indoor arena instead.