CB Dejan Lovren
Lovren and Matip accentuate each other nicely and there’s no reason it won’t be that way in the game. Mamadou Sakho is a decent choice, but Lovren edges him slightly here, despite being the same rating (same for Matip.)
The greatest facets of the Matip-Lovren partnership are that neither have weaknesses. Neither are slow, neither are short, neither are weak.