IMO, AN's inclination towards players who can play more than one position suggests a more flexible squad structure where Brady, if he comes in, could be a defender as well as a midfielder (or 2). If Turner leaves, that would leave 7 defenders and space for a quality CB to come in. Should Miquel go out on loan, that would leave 6 defenders and space for another quality CB to come in, making 8 defenders in all (including Brady or someone similar and Toffolo who is under 21).
We seem to be looking at a five man midfield, so that means around 10 players in midfield (given that Redmond still counts as under 21). At the moment we have 11, so O'Neil is most likely to leave if Mulumbu or another comes in. Two keepers makes the squad up to 20 (the third, Remi Matthews still counts as under 21). That could allow for all 5 of our present strikers to make up 25, but I suspect at least one will leave and be replaced by either a striker or an AM/Striker, leaving us with a 25 player squad plus Loza and Morris, who both count as under 21.
So overall, 2 new quality CBs, Brady and Mulumbu (or similar players) and at least one striker and/or an AM/Striker) building on the strong squad we already have.