Police will step up patrols in Harrow on Saturday to prevent football yobs from running amok on FA Cup Final day.
The decision to bolster forces follows disturbances after last month's semi-finals, at Wembley Stadium.
Fans of finalists Cardiff City and Portsmouth feature among the worst offenders on the Home Office's 'Hall of Shame' - a league table which records the number of banning orders handed down to thuggish fans.
Harrow Council's latest gadget, the CCTV van, will also be watching fans.
Nick Davies, chief inspector of operations at Harrow Police said: "The CCTV van will be in operation at Harrow-on-the-Hill train station to let supporters know quite clearly that we are watching them very closely.
"Obviously if there is trouble anywhere else the van will be deployed elsewhere.
"We have also been working very closely with pub licensees and they are taking a number of precautions to prevent any trouble."
Extra police will be deployed in Harrow town centre, Wealdstone and Stanmore before and after the game, while most pubs are only allowing only one set of supporters in their respective pubs.
At the semi-finals, played at Wembley last month, seven Portsmouth fans were arrested as their team beat West Bromwich Albion 1-0 while five Cardiff fans were detained during their 1-0 victory against Barnsley.