We need another top quality centre back like Van Dijk / Manolas /
Tah / De Vrij because Mertesacker won't be a regular and is retiring at the end of the season, Koscielny is ageing and has injury problems, Chambers seems like he may leave, Gabriel is injured rn and is inconsistent, Holding is class but still quite inexperienced and Mustafi
picks up loads of yellow cards.