Chelsea captain Cesar Azpilicueta apologised to the club's fans after Manchester City's 6-0 win at the Etihad Stadium on Sunday.
City's demolition of the Blues was their heaviest defeat in 28 years and made it four away losses in a row in all competitions for Maurizio Sarri's side.
Sergio Aguero hit a hat-trick, Raheem Sterling scored twice and Ilkay Gundogan was also on target as City ran riot to reclaim top spot from Liverpool.
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Chelsea slipped to sixth place on goal difference and are a point behind Manchester United in fourth as the race for Champions League qualification continues.