Sir Alex Ferguson was rushed to hospital this morning to undergo emergency surgery for a brain haemorrhage.
An ambulance was called to his home in Cheshire at 9am this morning and took him to Macclesfield district hospital.
A statement from Man Utd read: "Sir Alex Ferguson has undergone emergency surgery today for a brain haemorrhage.
"The procedure has gone very well but he needs a period of intensive care to optimise his recovery."
His son, Darren Ferguson, missed Doncaster's final game of the season against Wigan as news emerged.
The current condition of the 76-year-old former Manchester United manager is not yet known.