#2 Ethan Ampadu
Chelsea's search for a new centre-back probably came to an abrupt end due to the emergence of Ethan Ampadu in pre-season. The 17-year-old has arguably been one of Chelsea's best performers and his performances have certainly caught the eye of the new manager, who was not shy in trusting him with enough responsibilities during the last couple of weeks.
A natural ball-playing center-half by trade, Ampadu looked astonishingly comfortable and strong on the ball which further implied the fact that he is probably tailor-made for Sarri's infamous system despite his relatively humble age background.
The defender had already made his first senior appearance for Chelsea under Antonio Conte last season and with Chelsea preparing for numerous competitions in the form of the Europa League, Carabao Cup and the FA Cup to go with the hustle of the Premier League, Ampadu could become a handy option to have at Stamford Bridge this season.