British superstar Amir Khan is not planning to forget about his domestic rival, fellow former world champion Kell Brook.

For years, a contest between Khan and Brook has been pursued by promoter Eddie Hearn.

After Khan signed a multi-fight deal with Hearn, a showdown with Brook was within reach.

Hearn was confident that Khan-Brook showdown was going to be finalized.

But then Top Rank swooped in, and offered Khan a guarantee of $5 million to challenge WBO welterweight champion Terence Crawford on April 20 at Madison Square Garden in New York City.

Khan would eventually accept the fight with Crawford.

He claims that Brook's last performance, a tough decision win over huge underdog Michael Zerafa in December, was certainly a factor in his overall decision to face Crawford.

"I just feel that this has got the world title on the line, [Crawford is] pound-for-pound up there as one of the best pound-for-pound fighters," Khan told Sky Sports News.

"The Kell Brook fight is there, still. After his last performance, it was such a bad performance his last fight, I just thought it maybe even hurt the fight between us both. When I had the opportunity to take this fight against Crawford, I grabbed it with both hands and said 'I'm going to take this fight', because it's such a big fight. Being a world champion and coming back and fighting Kell Brook would be awesome, would be even bigger."

It didn't help matter that Khan also struggled in his last ring appearance, when he was dropped and hurt by huge underdog Samuel Vargas.

There is a still a demand from the British public for a clash between Khan and Brook, but that contest will certainly take a hit if Khan loses poorly with Crawford.

"I have to set my focus on [Crawford] first, win this fight and then move on to Kell Brook. Somewhere down the line, this is probably the last chapter of my career in boxing. Somewhere down the line, the Kell Brook fight will be there, and I'm going to give it to the UK fans," Khan said.