Even after Chelsea ’s Club World Cup success in the summer, plenty of people still insisted that the team were lacking in key departments - namely: defence.

That sentiment only grew once Levi Colwill, the club’s best centre-back, suffered a serious injury in his first training session of pre-season. It ended up being a cruel ACL injury that has ruled him out for the majority of the campaign.

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Sunday’s London derby against Arsenal has become a top-of-the-table clash, though, so impressive have Chelsea been so far this term. Defensively, they have four clean sheets from their last five games , and this partly explains why Gary Cahill — who knows a thing or two about what makes a great Chelsea centre-back — believes they do not need to upgrade.

“There

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