An 81st minute victor from Marcos Alonso gave Chelsea a 3-2 win on an afternoon of high drama, yet the holes in the defending at both ends contributed to a game that left both goalkeepers hopelessly exposed as chances aplenty were missed.
"You know what I said after the World Cup", he told RMC Sport.
"So I am very happy, also because I think that Kovacic can improve a lot here".
"We did very well for 75 minutes - 15 minutes at the end of the first half was disgusting". The same can be said of Arsenal under its new manager, Unai Emery, with the team showing the same defensive failings as under his predecessor Arsene Wenger.
But they had him craving one of his trademark cigarettes during a "horrible" 15 minutes when the Gunners forced their way back into a frenetic Premier League London derby.
"We have to improve because we did really well in the first 25 minutes today, but we need to continue to press in the other half".
"In the second half we played with two midfielders, 19 and 21 years old". Otherwise, for us it is maybe a problem.
It is unclear whether Sarri was joking, but his dependence on nicotine remains, as he is seen on the touchline using alternatives to smoking, such as putting a piece of plastic in his mouth to distract from the craving. But in the moment where we are not going to press in the other half, we are in trouble.
Chelsea forward Eden Hazard has reiterated that he is "happy" at Stamford Bridge and has no intention of leaving before the end of the month.
"But I think, I hope, that in one week, maximum two weeks, he'll be able to play the whole game".
Sarri believes Hazard isn't yet ready for 90 minutes after his exertions with Belgium at the World Cup, but acknowledged his side will be a different prospect once his star man is up to speed.