The loss was Chelsea's heaviest since 1991 when they were defeated 7-0 by Brian Clough's Nottingham Forest
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.
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.
The Blues have now lost three straight Premier League away games by an aggregate 12-0 scoreline and defender Azpilicueta acknowledged they were far from good enough.
"It is one of the worst nights in my career. It is difficult to explain what happened," he told Sky Sports .
"The first five or six minutes went well but that is not enough. It is very frustrating and disappointing. We are conceding a lot of goals and we cannot accept that.
"When you lose 6-0 we have to accept we didn't play well and made errors. We knew it would be tough.
"When we won at Stamford Bridge [ a 2-0 victory in December ] it was because we played well and were together. Today was not the case.
"All I can do is apologise to the fans because it is not acceptable."
The win puts Chelsea boss Sarri under mounting pressure at Stamford Bridge after he admitted last week that he struggles to motivate some of his players in west London.
Sarri has enjoyed success in cup competitions since arriving from Napoli last summer, and has some crucial games coming up in the Europa League, FA Cup and Carabao Cup respectively.
Chelsea face Malmo next time out on Thursday before a clash with Manchester United in the FA Cup, and play City again in the Carabao Cup final at Wembley Stadium on January 24.
The Italian will be hoping he can turn the Blues' form around in those outings, especially with their next scheduled Premier League outing coming against third-placed Tottenham at the end of the month.
De_Dean
109
These players are so unprofessional.... they should give up their weekly salaries and refund the ticket prices paid by the unfortunate away Blues fans who were at the forefront of this merciless beating from City.... Nonsense apologies after every dirty performance is not being professional.... Also, it's high time we called Conte back
georgeopoku700
69
we have problems and is the coach and his jorginho. ....we to want stylish play. ..why can the coach play nolo kante in the middle. I for instance blame the coach the overall poor performance. he can't change game when the playing doest suite and also changes which are not accurate. if he want to stay at the blues he must prepared to make changes accurate time not 8th and 85th minutes. he should go back and check kante middle as compared jorginho. we don't want acceptance of any apologies. ....[Cry][Cry]he don't want to learned anything please we don't want any stylish play and we need the place or position in the table. simply,is unacceptable excuses apologies tweeeea
Tacceiknrs
59
ChelseaFc manager Maurizio Sarri will destroy this ChelseaFc club in less than a year if the ChelseaFc ownerships don’t step in very soon and stop this avalanche. The fact Maurizio Sarri style of football can only take a team like ChelseaFc but so far in real competitive competition like the English premier league. Maurizio Sarri Styles of play is too easy to counter and out play on the pitch, not to mention he continues playing players in certain position they ‘re not 💯 % effect to change the game on the pitch where ChelseaFc can dominate. This ChelseaFc team has no leadership or continuity!