Seven defenders Chelsea should sign before the window closes

KALIDOU KOULIBALY

Measuring in at a whopping 6 foot 5, Kalidou Koulibaly seems almost tailor-made for Premier League football.

The Napoli centre-back combines no-nonsense physicality with trademark diagonal passes and at the age of 25 could quickly prove to be a very wise long-term investment.

However, top-class defenders are only available at a premium this summer and resultantly, Napoli may expect a record-breaking transfer fee.