Chelsea’s 4-0 defeat to Arsenal was an important reminder of how much progress the club needs to make in order to avoid underachieving.

After defensive departures and arrivals, this pre-season is a make or break for Chelsea's young centre-backs who are vying for roles.

Chelsea have had some awful signings, but who ranks in the top five worst of all-time?

Thomas Tuchel will decide on his system depending on the players he has available his disposal.