
One of the most successful managers in British history, Ferguson would by then have completed 25 years in charge at Old Trafford.
"I still have a lot of passion," Ferguson said. "I'm still happy. But I'm 66 now - maybe three years more, then I'll finish."
Asked about a possible successor, he went on: "I have a great assistant in Carlos Queiroz. He will come into the reckoning.
"But we have owners and a chief executive who will choose the new man in three years' time.
"The thing about football is we have some potential young manager, but because of the dangers, the hazards of management, they may not be there in three years' time."
DPA