The 67-year-old has been in charge of the Red Devils since 1986, winning 32 trophies, including two already this season in the form of the Carling Cup and FIFA World Club Cup.
However, son Darren - manager of League 1 high-fliers Peterborough United - believes his old man may finally retire from football at the end of next season if his side can claim two more Premier League crowns to usurp Liverpool's haul of 18 league titles.
"If they win this year then they catch Liverpool in terms of titles won," Ferguson Jnr told The Sun.
"I can see him doing this year and next, and then that might be it for him.”
Sir Alex has come close to retiring before, once revealing he would walk away at the end of the 2001/02 season, only to change his mind.
But having secured his second Champions League crown with United last season - beating Chelsea on penalties in Moscow - Ferguson revealed his intention to retire within the next three years, despite admitting that the thought of retirement is one that frightens him.
"I am scared to think about retirement." he said. "I have been on the train for so long that I am afraid my whole body might collapse when I get off."
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