Chelsea boss Jose Mourinho has hit out at Manchester United fans who turned on Sir Alex Ferguson this week.
Some fans turned on Ferguson after the Manchester derby defeat at Old Trafford on Tuesday over his part in appointing David Moyes.
But that prompted Mourinho, a close friend of Fergie, to speak out in his defence.
The Chelsea manager said: "He made United what United is. He deserves to retire and enjoy life. 'Now he's responsible for what? For what? United lose a match and it's his responsibility?
"United struggle in the Premier League and it's his problem? (Wayne) Rooney misses a goal, or (David) De Gea makes a mistake and it's his fault? Let him retire in peace."
