But Chelsea are still only a point away from Champions League qualification and Sarri, 60, has steered them to the Carabao Cup final, where they will play City, again, at Wembley in two weeks. It was very hard to come back from that.
The stories in Tuesday's newspapers involving Chelsea...
Chelsea surely have to experiment around after such heavy defeats, with Barkley and Alonso the best candidates to be dropped by Sarri.
Chelsea captain Cesar Azpilicueta branded the hammering at City unacceptable and apologised to supporters.
"There still seems no logical reason why Jorginho is favoured as Chelsea's midfield anchor ahead of N'Golo Kante, arguably the best in the world in his position", wrote Phil McNulty of BBC Sports.
"I think that City dominated that game".
The one advantage City does have in their race for the Premier League title is their squad depth. It's very frustrating, it's very disappointing.
Despite not necessarily enjoying the style of play under Mourinho, Hazard has fond memories of the 2014/15 season, winning the title with the divisive boss and also picking up Premier League Player of the Season.
The Spanish side knew how to get the job done, and perhaps that is something that suits Chelsea more than anything else, considering how they have achieved all their success in the last few years.
It could even have been worse for Chelsea as Aguero missed an early sitter and also hit the bar.
"It's hard to explain. I'll play the players we're waiting for instead".
"It's a great disappointment and we have to react". "At that moment we had to only stay in the match and we were not able to stay in the match because we made a lot of mistakes against the wrong opponents".