Although Aguero headed against the crossbar early in the second half, he only had to wait until the 56th to seal his 15th City hat trick _ and a record-equaling 11th in the Premier League with Alan Shearer. At the beginning [of the season] it worked. "Today I didn't see my football".
"It was really very hard not to give them space and so we were in trouble, but I am not able to understand because as I said before in the week I had a very good feeling", he said.
"I don't know [about my future]", he added.
The final scoreline was the worst of Sarri's coaching career and comes less than two weeks on from the dire 4-0 defeat at Bournemouth, which magnified the scrutiny of the Blues' development under the former Napoli boss.
"I am anxious about my team and the performance - my job is always at risk".
He said after the match on Chelsea TV: "For me the definition of madness is you keep trying the same things over and over again and it doesn't work and you keep doing it".
"But that result for City has confirmed after their hiccup, they're saying: 'We're bang at it, this is how we're going to finish the season".More news: Ariana Grande, A No-Show, Wins First Ever Grammy Award
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Gonzalo Higuain and Eden Hazard did threaten at times, but they could do nothing to prevent Chelsea's humiliation. "We did it, it's an incredible compliment to the players - they are outstanding".
"This kind of person, these type of games, the football helps to make it better".
"People don't understand how hard the first year can be".
"The people expect that it immediately comes, it needs time".
And looking ahead, with Chelsea facing a tough month both domestically and in Europe, Sinclair says he has seen nothing to suggest Sarri will shake things up. Standing between Chelsea and the League Cup is City in the final on February 24 at Wembley Stadium. Chelsea are sixth, behind Arsenal on goal difference and one point adrift of fourth-placed Manchester United.
Barça's forward has 21 before Sunday's game against Athletic Club.
It was a performance to send a chill down the spine of anyone with a Liverpool connection and one that emphasised why City are favourites to win the title race.
"He played the last two games and was key".