The clash at Elland Road is the first time the two rivals clubs have met since May 2004, with police recruiting police intelligence officers after labeling the game as high risk.
Chief Superintendent Paul Money said: "We want both sets of fans to get behind their teams and enjoy the football. We want the focus of the day to be the action on the pitch and for it not to be overshadowed by violence or disorder.
"I will also ask the managers of both teams to speak to the players and ask them to avoid doing anything which may antagonise supporters of the opposition team.
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Chelsea's away allocation has been cut from 5,000 to a more manageable 3,000 for the game and Leeds boss Warnock has called on both sets of fans to get behind their respective teams in a sensible manner.
"I'm sure the fans will lift the decibels and create a tremendous atmosphere," Warnock told the club's official website.
"It goes without saying while I want the fans to be loud we don't want any of the bad behaviour that we have seen from different sets of fans around the country this season and I ask everyone - both sets of fans - to get behind their own team without any of the unwanted problems."