Wat? Do you just like making things up? At Chelsea, they started very well, were undefeated after 12 rounds and in the title race... and then he had a terrible last 2/3 of the season in Premier League,
only staying in the top 4 because all the other top sides choked even worse. He collected 44 points from the last 26 matches of the season, which is terrible. They had 1 win in their last 5 matches of the season while fighting for a CL spot.

that they ground out some good results after they adapted. Certainly not in the league.
In the joke competition called Europa League, they won, so fair play to him for that, but they were by far the biggest club in that competition this year, and faced no one of note before the final (Malmo, Dynamo Kiev, Slavia Prague, Eintracht Frankfurt = So stronk) so hardly something to get super excited about.
And lol. Allegri managed to get out of the CL group stage every year at Milan, even after they sold all their stars. Sarri managed to get knocked out of the group stage by Shaktar during his record-setting year.
He has a lot to prove here, because aside from some "pretty" football at Napoli he's done nothing yet. Hope he does show he can be an elite coach here, because it would suck pretty bad to waste one of Ronaldo's last years with a classless chain-smoking bum if he doesn't get results.