Sir Alex Ferguson's son Darren Ferguson (manager of Peterborough) has tipped his dad to quit Manchester United at the end of the 2010 season.

Nobody really knows when Sir Alex will retire but whenever he does, it will be a massive day for Man United there will be a feeling of celebration for all he has done but also sadness, he has been an amazing manager and will be missed.

I am not old enough to remember other Manchester United managers and it will certainly be odd for me to see a different person in charge of Manchester United.

Darren Ferguson said: "His health is fine and he's building a new team," said Darren. "If they win (the Premier League) this year then they catch Liverpool in terms of titles won.

"I can see him doing this year and next - and then that might be it for him."