Amir Khan's scheduled opponent Neeraj Goyat has withdrawn from their fight due to injuries sustained in a car crash.
Khan will instead face Australia's Billy Dib, a 50-fight veteran and former world featherweight champion, on July 12 in Saudi Arabia.
"We are very sad to inform that our star Indian boxer Neeraj Goyat, who was preparing for his mega-fight against Amir Khan, met with a car accident last night that has caused him severe injuries on his head, face and left arm," promoter Bill Dosanjh told the Indian Express.
Live Fight Night International
"He is currently in hospital and we wish him a speedy recovery."
Khan was due to face India's Goyat with the WBC Pearl title on the line.
Two-time world champion Khan was stopped earlier this year by Terence Crawford in a WBO welterweight title fight but aimed to rebound against Goyat.
Speaking about longstanding rivals Kell Brook and Manny Pacquiao, he told Sky Sports News: "These names have always been spoken about and I really feel like those fights are still out there.
"The Brook fight is still out there, definitely. In Britain it would be a huge fight.
"There are still a lot of fights that [promoter Eddie Hearn] can make for me. I want to fight the top names."
Dib, stepping in to face Khan, said: "In life you get a limited number of opportunities to do something monumental, and like the greatest in any industry will tell you, when an opportunity comes knocking you answer. This is my real life Rocky moment."