Amir Khan has admitted the offer to challenge for a world title was too much to resist after overlooking a domestic dust-up with Kell Brook to fight WBO champion Terence Crawford.
The 32-year-old rejected terms to finally meet his rival Brook to instead pursue undefeated pound-for-pound star Crawford with their fight being confirmed on Tuesday for April 20.
Las Vegas' MGM Grand and Madison Square Garden in New York have been touted as possible venues to stage the event.
Despite the odds being stacked against Khan, the Bolton boxer has insisted he is confident of pulling off an upset and becoming a world champion for the second time.
'This is a brilliant fight for my legacy; he's one of the best pound-for-pound fighters in the world,' Khan said during Tuesday's press conference.
'A lot of people were taking about Kell Brook but this is a big fight for a world title and I couldn't turn it down.
'Styles make fights and maybe in the last fight I didn't look my best but I need fights that make me want to win.
'This fight will make me prove myself, I've been around a long, long time but I'm not past my best, I've got my best years ahead of me.
'If I take it lightly I'll get hurt, but I know I can win this fight otherwise I wouldn't be taking it.
'I'm unbeaten in the 147lb division and I feel comfortable at this weight. I know Terence is a switch-hitter but I have a 100 per cent record against southpaws.
'I'm going back to working with Virgil Hunter and he knows it's a dangerous fight, but he knows I'm capable of winning this fight.'
Khan - last a world champion in 2012 - has intriguingly made the decision to work under respected trainer Virgil Hunter again after two victories with Joe Goosen.
Khan v Crawford: Tale Of The Tape
Height: 5′ 8½″ / 174cm
Reach: 71″ / 180cm Fights: 37 Wins: 33 KOs: 20 Defeats: 4