Scores of officers could be removed from neighbourhood and response teams to police matches, force says.
Nearly 200 officers might need to be drafted in from neighbourhood and response teams to police football matches after a court ruled West Yorkshire Police could not charge Leeds United as much as it currently asks for covering games.
The High Court ruled the force could not charge the club for policing all of a â€˜footprintâ€™ around the Elland Road ground during matches â€“ but only policing within the football ground itself.
Mr Justice Eady said well-behaved fans were â€œentitled to expect police protectionâ€ outside the ground.
The force has said it could have to use up to 180 neighbourhood and response officers from across the force area to police matches and make operations cheaper.
Andrew Tempest-Mitchell, West Yorkshire Federation Chairman, said the force used officers working on rest days to police games under the previous financial arrangements because they could attribute the cost to the club.
But he said the judgement meant that taking on-duty officers away from their normal posts and putting them into policing games would likely be the cheapest option.
He added the Fed had serious concerns that the ruling would mean policing football matches would impact on the front-line.
A force spokesman said police adopted the charging arrangements, based on ACPO guidance, in 2009 and added they were used by forces all over the country.
The policing â€˜footprintâ€™ around the ground includes car parks, where buses drop off visiting fans, and nearby streets. All of it is within 283 metres of the ground, the force said.
Policing the Category C matches, where the likelihood of disorder is highest, costs the force around Â£80,000 per match. The force would normally claim Â£62,000 back from the club but the judgement will limit this.
The spokesman said: â€œThe judgement in favour of the club highlights the legal difficulties the force faces in minimising the large amounts of public money being spent on policing Leeds United. The impact of the judgement cannot be underestimated.
â€œWe will seek to meet with the club officials at the earliest opportunity to discuss how future matches can be safely managed in the light of the High Courtâ€™s findings.â€
Club Chief Executive Shaun Harvey said: â€œWe have never objected to paying for the cost of policing on land owned, leased or controlled by the Club.
â€œThe stance to seek to charge us for policing the public highway and for areas away from the ground is a step too far.â€
Football Policing Costs Judgement ‘Cannot Be Underestimated’