Chelsea vs Arsenal (3-2): Four Talking points

#3 Impact of the substitutions

Mateo Kovacic impressed on his Chelsea debut

It should be safe to say that the lineups Sarri has used in the first two premier league games might change as the season progresses. Eden Hazard looks the obvious choice as the left winger and would be the first name on the team sheet as he regains his full fitness. The Belgian is widely expected to have his best season as a Chelsea player as he finally gets to play in a system which suits his strengths. It was no coincidence that he set up Chelsea's winner against Arsenal, he is one of the few players in the world currently who have the ability to change the course of the match on their own.

A player whose place looks in danger is Ross Barkley. The 24-year-old has enjoyed plenty of playing time and has generally looked solid since the start of the season. Unfortunately for him, nothing more can be said about his performances so far. After he got substituted, Chelsea's midfield suddenly looked much more fluid and credit goes to his replacement, Mateo Kovacic.

The Croatian midfielder instantly changed the tempo of Chelsea's play and looked a natural fit in the midfield. His combination with Hazard was also a joy to watch and with Ruben Loftus-Cheek and Cesc Fabregas also fighting for a slot in Chelsea's midfield, Chelsea's starting eleven could evolve further, especially one can expect changes in midfield combinations.