Morata's Chelsea career to date has not been easy and Wednesday's match was another hard one, as his profligacy effectively cost the Blues a win.
Sarri wants to narrow the gap to City.
Chelsea did not have a great campaign last season and finished fifth on the Premier League table suffering a rather torrid title defense. In the next week we have a friendly match again. Not at the top level now but we have to try to have a good performance and a good result.
Sarri, who has not won a trophy in his career, said: "The match for us is very hard for one reason: they have worked all together for two years".
He took in the Genk game with STVV on the weekend and told local reporters: "I'm not going to comment on that now, it's a sensitive issue". So I don't know. "I think so He will be staying with us for all the season".
And keeping Chelsea's leading talents is the priority.
He reported late for Chelsea duty after the World Cup in Russian Federation, where Brazil reached the quarter-finals before being ousted 2-1 by Belgium.
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Manchester City boss Pep Guardiola has hinted that his clubs transfer business this summer may be over . Rivals Arsenal have made five signings with Liverpool on four and Manchester United one behind that.
Sarri made it abundantly clear earlier in the week that he was unimpressed by Willian's late arrival, though after having a discussion with the Brazilian, the air has been cleared and the coach expects his attacker to stay. "I don't know if he will be able to play on Sunday. I'm so happy he came here".
"I think we need something", he said.
"It's the best league in the world and I want to play here".
"We have very good midfielders, but maybe a midfielder with different characteristics [would be a good fit]", he added.
Sarri was missing a host of first-team stars like Eden Hazard and N'Golo Kante, but urged his players to step up their efforts after an easy win for City.
The under-17 World Cup victor, who played the full 90 minutes in England's 5-2 win over Spain in the final, also endeared himself to Blues supporters after the game with a great gesture.