The Premier League are to urge fans to behave themselves ahead of the festive fixtures - following a spate of incidents at recent matches.
On Sunday, the Manchester United team bus was hit by a bottle in the latest 'welcome party' held by Liverpool supporters for the arrival of their opponents.
Damage was caused to the vehicle with United joining City and Real Madrid among those targeted in recent times as they made their way to Anfield.
Merseyside Police are investigating, with Liverpool vowing that anyone caught will face club sanctions.