Kalidou Koulibaly will enhance Chelsea's defence with formidable tackling and a willingness to throw himself into blocks... but how does he compare to his new team-mates and the Big Six stalwarts?
Kalidou Koulibaly will enhance Chelsea's defence with formidable tackling and a willingness to throw himself into blocks... but how does he compare to his new team-mates and the Big Six stalwarts?......
