Antonio Conte criticised his Chelsea players for failing to justify their reputations after Arsenal surged to a 3-0 win over the Blues on Saturday.
Chelsea capitulated in 40 first-half minutes at the Emirates Stadium as goals from Alexis Sanchez, Theo Walcott and Mesut Ozil gave the Gunners a first Premier League win over their London rivals since October 2011.
The defeat leaves Chelsea eighth in the table after consecutive defeats to top-four rivals, and Conte held nothing back in his post-match assessment.
If someone thinks this season is easy, we must work a lot to improve and change the situation because now we are a great a team on the paper, not on the pitch.
I prefer to be a great team, not on paper, but also on the pitch because the pitch speaks the truth, the pitch is the most important thing for us. Not the words, not the paper. We must change this.
Last season was a bad season and last season we were a great team on the paper. This team we want to be a great team also on the pitch.
There are many difficulties but if we understand this we are in a good position to recover and to change the situation.
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Jose Mourinho has blasted the "football Einsteins" who criticised his Man United team after they brought a run of three straight defeats to a halt with an EFL Cup win at Northampton.
The Red Devils saw off their League One opponents following defeats against Man City, Feyenoord and Watford in the space of eight days.
Speaking to Man United's MUTV after the victory at Sixfields on Wednesday evening, Mourinho accused his critics of having very short memories.
The former Chelsea manager, who welcomes Premier League champions Leicester to Old Trafford on Saturday, said:
I know that some football Einsteins – football is full of Einsteins – I know that they tried to delete 16 years of my career.
They tried to delete an unbelievable history of Man United football club and to focus on a bad week with three bad results. But that's the new football, it's full of Einsteins.
I can understand clearly the disappointment if the fans are disappointed with the last week.
I understand completely, but I'm sure that with the team going back home [against Leicester City on Saturday] they will be behind the team like they always are.
Antonio Conte has warned Chelsea not to repeat the mistakes of last season.
The Italian manager was left reeling by his first defeat in charge of the Blues after Liverpool ran out deserved 2-1 winners in the Premier League contest at Stamford Bridge on Friday night.
"It's important to understand that every game is tough and we mustn't forget last season," said Conte. "Last season was a bad season and I don't want to repeat it.
"When you finish the season in 10th place it means you have to work very hard to improve and not repeat the bad season.
"This season the manager, the players, all the people at the club must take responsibility. We win together and we lose together."
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Frank Lampard believes Antonio Conte can lead Chelsea to a serious title challenge this season.
The Blues' record goalscorer is still an avid Premier League watcher despite plying his trade with New York City in Major League Soccer and thinks Conte is the man to turn around his old side's fortunes.
Lampard has heard good things from Andrea Pirlo, his New York team-mate and a former Conte player with Juventus and Italy.
"Being at Chelsea for such a long time I have an allegiance so I would obviously like Chelsea to win the league and I think they'll be back challenging," he told BBC Radio 5.
"I do fancy it being between Chelsea and Manchester City this year.
"I spoke to Pirlo (about Conte) about him and he had nothing but great things to say. He works the lads very hard in training with his fitness work and with organisation on the pitch.
"The players will need to buy into that and respect that then you'll see an improvement from last year."
Antonio Conte has told Chelsea to emulate the team spirit Claudio Ranieri fostered as Leicester City swept to last season's Premier League title.
Former Italy boss Conte has admitted he will struggle to sleep the night before Chelsea host West Ham in Monday's season opener at Stamford Bridge.
"It's a fantastic example," said Conte of Ranieri's team spirit at Leicester.
"And I think that a great club must always look to the last season for what happened. Because a team, a great team, who win the league, became a great team, Leicester.
"Ranieri did a fantastic job and the players did a fantastic job, because they created the right spirit.
"And when you watch Leicester's games you understand this great feeling between the players. Every player is ready to help his team-mate because he knows in another situation his team-mate will help him.
"It's important to have this if you want to win. It's important to have talented, fantastic players, but it's important as well to create the right spirit."