EPL:  Sir Alex Ferguson , Manchester United (Getty Images)

    Sir Alex Ferguson has revealed his biggest fear is not whether Manchester United fail in their bid for a 19th league title this season,
    but for his own health.

    Having postponed his retirement from the game over the past few years,
    many have questioned how long the wily old tactician can continue his
    illustrious career in the Old Trafford hot-seat.

    And speculation has again arisen that the United chief could be thinking
    about finally stepping down in the near future after admitting he had health
    concerns at a charity dinner in aid of referee Mark Halsey's cancer
    foundation.

    "I'm confident about myself, I'm not going to change what I am, I just
    hope my health is okay," Ferguson told the audience.

    "At 68-years-old, when you go to sleep at night all you want to do is
    just wake up the next morning.
    "In the last three or four years, three or four of my really top scouts
    have died, all in their 60s.

    "I've been to their funerals and it's there but for the grace of God,
    really. You couldn't possibly do your job unless you were healthy."
    Sir Alex insisted the search for his replacement has not yet
    begun, but stated the importance on finding the right man at the
    right time, in light of the volatile nature of modern day football.

    The latest rumours are that the 11-time Premier League winning
    manager will finally retire in two years’ time, once he has
    successfully surpassed Liverpool’s record of 18 titles.

    "A manager can have success, but then in two years' time it
    could be finished," he added.

    "When I go, Manchester United will need a manager who has been
    successful, but in two years you don't know what will happen.

    "You can all think about the successful managers at this moment
    in time, but in two years' time they may not be, may not even be
    in a year.

    "So it is very, very difficult to say who would replace me when my
    time came because it is the success of the moment that people
    talk about."

    Despite sitting a point behind Chelsea in the season's finale on
    Sunday, Sir Alex has still not given up hope of a fourth consecutive title.

    He expects Wigan Athletic to provide stern opposition to the
    table-toppers at Stamford Bridge and asserted that any slip-ups
    from Carlo Ancelotti’s men will be seized upon by United.

    Sir Alex knows the importance of concentrating on the task in
    hand for his side, who faceStoke City at Old Trafford, and give the
    fans a great end to the season.

    "We have a chance to win it [the Premier League]. I am sure
    Wigan [Athletic] will try [against Chelsea], they won't just lie down.
    We live in hope," he added.

    "It's the last day of the season and we have to represent the club
    in the way we know how and that's in the proper fashion.

    "It's the only way we know. It's our last home game of the season,
    we owe it to the fans and we know we can win the game.
    After that we will see."