In a 3-5-2, all we need in the starting XI are two new strikers. Assuming that Llorente is one, then we just need that second guy. In such case, we need to improve the bench with 3-4 players who can take on the starters and give us more quality than the current bench players. I'd say, we need a LWB, CB, MC (or two) to complete the bench. Regarding this, Zuniga would be a welcomed signing.
But we will probably work on some other signings, like wingers who'd start in a 4-3-3. As GDS claimed that Conte asked from the board, we need 6-7 new players.