"They beat us at Stamford Bridge and against Napoli [Sarri's old club] last season they were tight games - in moments of those games, they were better than us".
Our football writers have their say.
While City responded in the flawless manner to Liverpool's victory on Saturday, Chelsea looked far from the top-four side they aspire to be. It was a masterclass - Patrick Vieira dominating midfield, Robert Pires...
The prolific Argentinian joined Alan Shearer on 11 Premier League trebles as the champions returned to their ruthless best in a one-sided encounter at the Etihad Stadium. So now we need only to understand the reasons why at the moment it isn't working.
City led 4-0 after 25 minutes as Chelsea lost their third straight away game, conceding 12 goals without reply.
We'll keep you up to date with the very latest transfer news concerning your club in our daily football gossip and rumours column. Silva had weaved through the area to set up a gilt-edged opportunity but the Argentinian uncharacteristically poked wide.
"Out of nothing", Sterling said, "he can put the ball in the top corner and players like this, you have got to cherish". Aguero was lurking in the six-yard box and punished the former Everton midfielder with a sharp turn and shot.
City eased off for the remainder of the first half, and Gonzalo Higuain even managed to test Ederson with a sharp volley, but the hosts clicked back into gear after the break.
Aguero completed his hat-trick from the penalty spot to move level with Liverpool's Mohamed Salah as the Premier League's top scorer on 17 for the season.
"Sergio Aguero has lifted City in the last month". Aguero stepped up and sent Kepa Arrizabalaga the wrong way from the spot.
And Silva's pass opened the visitors up again for the sixth as he picked out Oleksandr Zinchenko who crossed for Sterling to round off the scoring 10 minutes from time. Tottenham are five points back, also from a game less.
Aguero should have doubled the lead nearly immediately but remarkably missed from two yards.
Just as Leicester pressed for an equalizer, Son Heung-min scored a breakaway goal, racing clear from the halfway line and converting his 15th of the campaign in the first minute of stoppage time.
Cardi B Performs ‘Money’ at Grammys
She won the best pop vocal album trophy for Sweetner beating Taylor Swift, Kelly Clarkson, Pink, Shawn Mendes and Camila Cabello. Following an opening from a pianist, Cardi emerged in a sparkly black jumpsuit while strutting her stuff like a showgirl.