Chelsea have not won the Premier League since Antonio Conte led them to the 2016-17 title - and facing the Italian's Napoli side on Wednesday brings that into sharp focus.
Conte's triumph came in the season when Pep Guardiola began his reign as Manchester City boss.
It was Conte's first campaign in England, too, and Chelsea enjoyed a club-record 13 consecutive league wins on their way to lifting the championship with 93 points.
Their fifth Premier League crown in 13 seasons matched Manchester United's achievement in that same period.