AMIR Khan says he will drop back down to welterweight after suffering a fourth defeat of his career against Saul ‘Canelo’ Alvarez in Las Vegas on Saturday night.

The Bolton fighter was knocked out in the sixth round by the Mexican WBC middleweight champion.

He was taken to hospital afterwards as precaution but was quick to assure fans he was fine after being checked out.

He said on Twitter: “I’m okay everyone. That’s boxing for you, congrats to @Canelo monster punch, much love to all the fans!''

Once he returns to Lancashire, Khan will look at his future options after losing on his rise to middleweight level.

Whoever he faces next, his sights are on fighting at what he believes is his natural weight of 147 pounds.

Khan said: “I'm a natural 147 (pounds) fighter.

"I want to be the best, I want to fight the best and that's why I took this fight.

"I showed my bravery by getting in the ring with Canelo, but this is boxing.

"I wanted to go out there as a champion. I was unfortunate that I didn't make it to the end, but I tried my best and I want to say thank you for the support.

"I will probably go down to 147 now."

Alvarez, who knelt beside Khan to check he was okay after delivering the knockout blow, was naturally delighted with the victory as he eyes a showdown with WBA and IBF champion Gennady Golovkin.

The Mexican said: “It was a human reaction to (kneel down and) make sure he was okay and I'm glad he appears to be.

"You want to win by knockout, but you don't want to hurt anybody.

"It was a little difficult at first, but I knew that I just had to keep to my game plan, and keep feinting, and that's what opened up that (knockout) punch.”

Khan’s trainer Virgil Hunter commended his boxer for taking on the challenge of Alvarez and said: “He took the risk, gave up everything for the challenge and did not hide away from it.”