Napoli ultimately let Sarri go, but the relationship between both parties has subsequently become strained, as a war of words is waged in the media.
Having voiced concerns about how quickly his new players would adapt to his methods, Sarri's problems right now appear to revolve around who to leave out of his line-up. I don't know for 90 minutes.
Like Chelsea, the humble Hertfordshire club, whose only season in European football was 35 years ago, completed their third victory from three games on Sunday, when they beat Crystal Palace 2-1 to add to victories over Brighton and Burnley.
But it is clear that Sarri wants more of an on-the-ball player to begin the team's attacks at the base of the midfield.
At the interval, Newcastle must have sensed they could collect at least a point, a target that appeared to be more hard before the start when Benitez was forced to rule out two of his most influential players, Jamaal Lascelles and Jonjo Shelvey. They know the city, they know club.
"But if you have to pick three, I will pick these". You have to change completely. I think, if you arrive to think in this way, then it's very easy. It depends on the card you have and each team is different. There was no wastefulness in possession and plenty of movement ensured that the Blues maintained intense pressure on their opponents throughout the 90 minutes.
Sarri's defensive plan doesn't involve only pressing. I remained in London. "If you defend forward, you only have to do 10-15m", Sarri continued.
Benitez hit back, saying: 'You have to drive the vehicle you have.
He said: "We are talking about the Premier League now and the difference between teams now is so big".
DF David Luiz, 6 - Was beautifully balanced on the ball and used it very well. We were immediately in trouble.
As some fans on Twitter noticed, Loftus-Cheek seemed a bit disappointed after failing to get the high-five, but he'll be even more concerned about his current role. He also took the shot for the victor that deflected off Yedlin into the back of the net.
Chelsea enjoyed 79 percent possession in the first half. "So I think that Eden will stay with us for all the season".
"But I'm not able to switch off".
At half-time Souness and Redknapp launched a scathing attack on Benitez's approach, with the latter claiming "it's not football".