UEFA has opened disciplinary proceedings into alleged racist chanting by Chelsea fans in the Europa League game with MOL Vidi.
A vocal minority of fans chanted offensive songs about Tottenham fans in the 2-2 draw in Hungary on 13 December.
Chelsea said fans who sang an anti-Semitic chant during the game had “shamed the club”.
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Uefa’s control, ethics and disciplinary body will rule on the case at its next meeting on 28 February.