Chelsea could make a move for a top central defender this summer. While Chelsea are not short of central defensive options on paper, it has been a bit of a problem area for Mauricio Pochettino this season. First of all, it is worth mentioning that the Blues’ defence as a whole have conceded so many goals lately. Sheffield United put two past them over the weekend, while Manchester United managed to score three times at Stamford Bridge the match before. Focusing on Chelsea’s central defence specifically, though, they have had a lot of injuries there and Thiago Silva’s contract is up this summer…