Kell Brook is in disbelief that what he felt was a likely fight with Amir Khan is going to once again fall through the cracks.

Brook returns on Saturday night against Michael Zerafa in Sheffield.

But BoxingScene.com revealed on Monday that Khan was offered a $5 million guarantee to face WBO welterweight champion Terence Crawford on March 23 at Madison Square Garden in New York City.

Khan confirmed the report and said that he's now seriously considering the idea of facing Crawford instead of Brook. He believes the Brook fight can be done at a later time.

"I would liked to have announced our fight in the ring and give fans an early Christmas present. But it does not look like it will happen. It looks like he has run off again. I have done everything in my powers for it to happen. It is him who has let the public down - 100% it's on him," Brook told BBC Sport.

Brook also made it clear that he won't stick around for Khan, who believes the fight will always be there.

"It's not [going to be there]. I am going to go after the big names in America and the fights all the fans want. I am going to do my thing. I don't need him at all. It's just a tick, a grudge match - the years of bad blood form each other," Brook said.

The backup plan for Brook is to pursue the big names and world champions at welterweight and junior middleweight.

"It's not the end of the world and I will move on. I am more established at welterweight being world champion," said Brook. "I will be hunting these guys and the weight above at light middleweight."