Brazilian Jorginho is the only big-name addition to a Chelsea squad that came up horribly short in the defence of their Premier League title last season, yet Sarri still believes his side are ready to take on Manchester City in today's Community Shield match at Wembley.
Manchester City last lifted the Community Shield in 2012, defeating this year's opponents Chelsea 3-2 in a fixture that was played at Villa Park.
New Chelsea manager Maurizio Sarri could win a trophy in his first official game with the reigning FA Cup champions.
Some of their lethargy going forward could be put down to the heat, which made it hard for both sides to sustain any sort of tempo.
With Kevin De Bruyne among several first-teamers rested after his World Cup exploits for third-place Belgium, the manager gave a start to young England prospect Foden, who responded with a performance well beyond his 18 years.
But they produced a controlled and efficient performance to secure their third piece of silverware in the past six months. With the player already looking like a potential match-winner for Chelsea, it looks like the Premier League champions have missed out on a big fish, and the early signs could be visible on Sunday. Summer signing Jorginho, who chose Chelsea over City, seemed quite off the pace.
As Chelsea looked to move forward, Callum Hudson-Odoi embarked on a threatening run before he was tackled - but that proved only to be the prelude to a City breakthrough.
"We have seven days to train this week, and hopefully we can increase that level".
But he will arguably never score a more important goal than his 94th minute victor against Queens Parks Rangers in May 2012 that secured City's first league title for 44 years. But while City have high calibre replacements, Chelsea are a far poorer team without Eden Hazard, N'Golo Kante and Thibaut Courtois. It should've been 2-0 within five minutes of the restart as Aguero got in behind only to see his attempt to around Caballero thwarted by his worldwide team-mate.
The deep-lying playmaker was a key figure for Sarri in Serie A, making more passes than anyone else in the top five leagues last season.
Both goals came courtesy of fine team moves - and both were started by City's centre-backs.
Here is how we rated the Chelsea players at Wembley.
"So, I think it's a long way we have to work".
"I'm very happy with David, for his attitude".
Despite holding a two-goal lead, it was all City at this stage and Caballero was called into action to deny Aguero his hat-trick from a ferocious back-post volley.