Amir Khan believes beating Saul 'Canelo' Alvarez would rank as the greatest achievement of his boxing career.
Alvarez will put his WBC middleweight belt on the line against Khan in Las Vegas on May 7 in a catchweight bout.
Khan is moving up two weight classes from welterweight for the fight and the Briton, who has previously held the unified WBA and IBF light-welterweight titles, told Sky Sports: "It's going to be amazing to be called the middleweight world champion and that's like a dream come true.
"Even though I achieved a lot in my amateur days and went to the Olympics and also as a professional becoming a two-weight world champion, I still think winning this fight against such a big name in Canelo, and becoming the middleweight champion, will be bigger than anything I've done."
Khan is taking inspiration from Sugar Ray Leonard, the five-weight world champion who made the jump from welterweight to middleweight to defeat Marvin Hagler in 1987 and win the WBC belt.
"I know it can happen, because we've seen it happen in the past, when Sugar Ray Leonard took on Marvin Hagler," Khan added.
"He was in a very similar position to me, where people were saying he was going to get beaten up, get knocked out and get hurt. He was going up two divisions and he went in there and beat Marvin Hagler.
"Sugar Ray Leonard was a great, great fighter but I really believe this is going to take me to up to another level."