10. Kalidou Koulibaly — SSC Napoli <img class="lazy-image" src="data:;base64," alt="Koulibaly" data-content-type="image/png" data-srcs="{"https://image.businessinsider.com/5e149664855cc23cc50466c8":{"contentType":"image/png","aspectRatioW":1386,"aspectRatioH":1039}}" />   Getty/SSC Napoli   Almost all of Europe's biggest clubs are rumoured to be interested in taking Kalidou Koulibaly away from Napoli.…