A back-up centre back will do I think but we've not really been linked with one. Sakho and Tomkins have played 15 league games together and we've won 10 and drawn 5 in those so they have the basis of a really good partnership...about as good as we'll get without a big outlay anyway. I actually think Tomkins is a more consistent player than Sakho to be honest, definitely got less mistakes in him and scores a few goals as well. Back-up is a bit ropey with Martin Kelly but he's solid enough and we've also got Scott Dann coming back from injury soon which will be a boost.
I think we're also set for full-backs to be honest, expect Aaron Wan-Bissaka to edge out Ward as the season goes on and nail down the RB slot this year, Van Aanholt is also about as good as we can expect down the left. The focus has rightly been on midfield with Cabaye and RLC going but hopefully that's about to be addressed.