#1 Quickly imbue his footballing philosophy into the squad
Sarri has earned a reputation as a football maestro while working in Italy. He has his own style and philosophy that's been widely appreciated. But it's a different league now and a different set of players who are used to a more defensive and direct kind of football completely in contrast to his. It's one thing to play free-flowing football in the less competitive Serie A; it's quite another to replicate the same in arguably the most difficult league in the world.
This is not to say he doesn't have the expertise for such a challenge but the prospect of overhauling a mindset and a team drilled by Conte's methods in a limited timescale of few weeks, looks daunting.
It's not even a week since Sarri's appointment and people are already talking about a possible title challenge. Patience is in short supply here and everything the new boss does, has to be quick and productive as they can't afford to lose too much ground early on in the tournament.