...our back 3 invariably means a back 5. We have no wing backs, just full backs.
We desperately need attacking threat from wide areas, I’d be amazed if that is not the key transfer requirement. Digne at FB and an attacking, conventional left winger provides real threat on the left. Similar requirement on the right.
We are ok at CB, I can’t see us acquiring unless Mina leaves (Keane won’t leave & if Holgate goes he won’t need replacing). A RB, two wingers and a back-up striker would be my guess at the shopping list.