The Italian has left Stamford Bridge after only one season in charge, in which he won the Europa League and guided the club to a third-placed finish in the league.
Now reflecting on his time in west London, Sarri says it was a struggle to form a coherent brand of football with the Blues.
"Chelsea is a team made up of players, probably who have a higher technical level but with individual characteristics.
"They have players who play on the flank, want to play one v ones so from that point of view, the football they play is less fluid, less smooth.
"Compared to Napoli where they could all play well [together], at Chelsea there were seven or eight players playing individualistically. They were effective, solid and that was so not so easy to defeat."