The clubs continue to work together and respect the great rivalry between them but will not condone any offensive or discriminatory behaviour in Anfield Stadium or Old Trafford.
In a joint statement, the clubs said: “Both clubs, their supporters and football fans around the world are looking forward to this historic and passionate match between two of the sport’s biggest and oldest rivals.
“There is great rivalry between our fans and we ask all supporters to be respectful and help eradicate all forms of offensive and discriminatory behaviour from the game.
“If any supporters are found to be engaged in any form of offensive or discriminatory behaviour by stewards or via CCTV then they will be immediately removed from the stadium, risk arrest, prosecution and be reported in accordance with the club’s ground regulations.