The mantra that attack wins you games but defence wins you titles is cliche but still seems to ring true. Having a solid base for Thomas Tuchel was his first step as Chelsea manager and now he has found himself without two of his Champions League winning backline it's time for change.
The search for new defensive reinforcements has dominated Todd Boehly's summer so far as the club look for apt replacements for Andreas Christensen and Antonio Rudiger.
Kalidou Koulibaly has already been purchased and the 31-year-old experienced defender will add great quality and leadership to Chelsea's backline next season, be it in a four man or five man system.
