#5 Eden Hazard
Despite all the talk, Eden Hazard appears to be staying at Stamford Bridge this summer. Comments by the Belgian following an excellent World Cup suggested that he was hoping to join Real Madrid, and although the transfer window is still open in Spain, it is inconceivable that Chelsea would be prepared to sell their prized asset without being able to bring in a replacement.
As he will now be playing under Sarri, he may be able to improve his game under the Italian. Having played under Antonio Conte and Jose Mourinho for the past five seasons, he has been managed by defensive coaches, so Hazard has never really had the players around him to succeed. Sarri though will play an attractive, attacking style of football, that should allow Hazard to have a massive influence on the field, and play his best football.