Eden Hazard has implored supporters to behave when London rivals Chelsea and Tottenham meet in the first leg of their Carabao Cup semi-final on Tuesday.
Chelsea fans have come under increased scrutiny this season following a number of high-profile incidents, including alleged racist abuse of Manchester City's Raheem Sterling last month.
That was followed by a situation at a Europa League match in Hungary, when a section of Chelsea supporters were accused of anti-Jewish chants, reportedly focusing on Spurs.
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The two clubs face each other at Wembley on Tuesday and there is expected to be a heightened security presence, with officers reported to be specifically listening out for "hate crime".