#2 Convince Hazard to stay
To say Eden Hazard is an important player for Chelsea would be an understatement. He is in fact up there as one of the very best players in world football at the moment. The Belgian's impressive run in the recently concluded World Cup has only seen his stocks rise to a new high.
Reports linking Hazard to the most successful European club Real Madrid, have been doing the rounds for last couple of years. However, Cristiano Ronaldo's stunning move to Juventus has suddenly added substance to all the speculations about him joining the Spanish club.
So the single biggest challenge before Sarri is to convince the forward to stay at Stamford Bridge.
The upside of Antonio Conte's departure is that he can finally play in a more progressive system under Sarri with a lot of freedom up front to showcase his world class ability. However, the prospect of a season without Champions League football might not go down well with him.
It's thus fair to say that keeping Hazard at the Bridge will pretty much define the upcoming season for the Blues.