Chelsea have been guilty of trying to "play too nice" this season, according to Frank Leboeuf, who says the Blues must learn how to win "dirty".
Everton handed Chelsea their second Premier League defeat of the season at Goodison Park on Saturday night.
Gylfi Sigurdsson's first-half penalty was enough to give the Toffees a 1-0 victory as Frank Lampard's side struggled to create any clear-cut openings.
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The result saw the Blues slip to fifth in the table, three points behind current leaders Tottenham, with a tough clash away at Wolves up next on Tuesday.