Merseyside Police have promise "firm, fair and friendly" policing at Anfield tonight as Liverpool welcome Barcelona for the second leg of the Champions League semi-finals.
Officers say they expect a "vibrant atmosphere" - but say they are working with both clubs and other partners across the city to make sure it's a safe and enjoyable night for all.
Match Commander Superintendent Paul White said the force "will take action where necessary, against those individuals who may seek to cause problems or misbehave and spoil the evening for the majority of supporters."
Fans are also being urged to remember that using flares or other pyrotechnics could result in a prison sentence.
We know that this will be a busy operation with the eyes of the footballing world on Liverpool and we hope that fans attending the match will act as ambassadors for their clubs and enjoy what I am sure will be a good game.