Chelsea have already signed several centre-backs in the last year and a half, with the likes of Axel Disasi, Wesley Fofana and Benoit Badiashile coming in, while Levi Colwill returned from a loan spell at Brighton in the summer. They also already have Thiago Silva, Malang Sarr and Trevoh Chalobah available to coach Mauricio Pochettino. But with 39-year-old Silva's contract set to expire in the summer and Chalobah expected to leave, they are in the market for another option.