The Irish Football Association led the mourning in George Best's native Northern Ireland, for whom he made 37 appearances and scored nine goals.
IFA chief executive Howard Wells said: "This is a sad day for football. George was a complete one-off with a natural talent rarely seen since.
"I had the privilege of entertaining him when I worked in Hong Kong and I also saw one of his early internationals for Northern Ireland, in 1964. He had this incredible balance, speed and grace. He was the best I had ever seen."
IFA director of coaching Roy Millar added: "He was an icon of Northern Ireland football and he will be remembered for his performances for Northern Ireland and Manchester United. He was the most talented footballer Northern Ireland has ever produced and he was a world star."