MIKE Tyson, Evander Holyfield and Floyd Mayweather are among boxing legends to pay tribute to Muhammad Ali.
Tyson – who was the youngest boxer to win the WBC, WBA and IBF heavyweight titles – said: “God came for his champion.”
Football presenter Gary Lineker said the three times world champion was the “most magnificent athlete,” who transcended sport.
"Words can't explain what Muhammad Ali has done for the sport of boxing," Floyd Mayweather said.
"He's one of the guys that paved the way for me to be where I am today.
Four-time world heavyweight champion Evander Holyfield said: "I'm glad to have known Ali because when I was a kid, at eight years old, I was told I would be like Ali.
"To take it upon yourself and say; 'I'm the greatest', you put yourself in a position for people to take pot shots at you – this is what Ali did.
"It's amazing, him becoming three-time heavyweight champion of the world.
"You have to be stronger to get up from a loss to go on and that's what Ali proved to be."
George Foreman, who lost to Ali in the 1974 world championship fight, The Rumble in the Jungle, said that there was no question that Ali was the greatest.
"He was one of those things you see maybe only once in a lifetime. Like a total eclipse.
"You are not going to see anything like that again. Boxing doesn’t do enough to define what he was.