The 67-year-old tactician has been in charge of The Red Devils since 1987, and the Scotsman already overturned an earlier decision to step out of football in 2003.

"When I reached 60, I asked myself the question, and I almost left," Ferguson told L'Equipe.

"But I quickly realised, with my family, that it was a mistake. Today, I fear the idea of retiring."

Before managing United, Ferguson made his name coaching both Aberdeen and the Scottish national team.

"I have been on the train for so long that when I get off I fear my system will collapse. I have decided not to ask myself the question any more."

During his glorious stint at Old Trafford, Ferguson has won everything with United, including 10 league titles, 5 FA Cup trophies, two UEFA Champions Leagues, one Cup Winners Cup and a Club World Cup title.

"Three things can make me stop. 1. My health. 2. If I don't take pleasure any more. 3. If I don't have the strength for new challenges any more. "

"Each summer, I have a look at those three things. I go to my doctor first. I had a pacemaker set up four or five years ago.

Ferguson considered that he may have to retire soon, as his health will not take the pressure of the game anymore.

"Today, I am playing the penalty shoot-out of my managerial career. I know that. The rest is decided between me and me.