#3 Eden Hazard
This is a little biased coming off a Chelsea fan, but you cannot argue that the Blues look like a completely different squad with Hazard in their ranks. Surely after 2 weeks of rest and training, Sarri will now turn to his talisman to take over familiar duties.
The Belgian has featured in only 45 minutes so far (15 minutes against Huddersfield and 30 minutes against Arsenal) and already has 2 assists to his name, and should have arguably had more.
Under Sarri, Chelsea are a much more attacking side and when utilized to his strengths, Hazard is a force to be reckoned with - as was explicit during the WC games. At 10.5 million, he is expensive and a gamble at this point, but the rewards are more likely than not. Besides, what are you going to do with Mahrez now?
Opponent next week: Newcastle United