By Matt Barlow for the Daily Mail
Published: 22:36 GMT, 7 January 2019 | Updated: 22:36 GMT, 7 January 2019
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A semi-final which promises to deliver the best of London football on the pitch has both clubs fearing what they might hear from the Wembley stands.
Almost 5,000 Chelsea fans will be accompanied by Stamford Bridge stewards, and security will be tight for Tuesday night's Carabao Cup tie, the first derby against Tottenham since anti-Semitic chants resurfaced last month at a Europa League tie in Hungary.
These old songs, which use the Y-word to refer to Spurs fans, prompted UEFA to open an investigation and sparked an angry reaction from Roman Abramovich. The same songs were heard briefly in the away end at Watford on Boxing Day.
Chelsea boss Maurizio Sarri has urged fans not to sing offensive songs about Tottenham
Chelsea owner
