Sir Alex Ferguson says he won't be motivating his United players with tales of revenge ahead of their clash with Manchester City.
The blue half of the City did the double over the Reds last season, but the United boss says his side enjoy the challenge posed by their noisy neighbours.
Fans' leaders claim erecting netting to prevent missiles being thrown at players would be a knee-jerk reaction.
The Manchester City fan who ran on to the pitch and tried to confront Rio Ferdinand in yesterday's derby match has apologised.
Nine people have been charged people in connection with yesterday's Manchester derby.