- Liverpool hosts Manchester United Monday
- Clubs issue warning ahead of Premier League clash
- Both teams in the hunt for league title
(CNN)Few football matches can claim to draw a bigger audience.
An estimated 700 million people -- nearly 10% of the world's population -- in over 200 countries are expected to tune in when Liverpool hosts Manchester United in the Premier League Monday.
But the lucky 54,000 fans attending the match at Anfield have been warned to be on their best behavior.
Unsavory songs by both sets of fans have been sung about tragedies in the clubs' pasts, Liverpool's Hillsborough disaster and Manchester United's air crash.
Last season, before the two sides met in the Europa League, a banner that read "murderers" -- in reference to the Heysel tragedy involving Liverpool -- was hung above a major road leading into Manchester.
"If any supporters are found to b