Presuming it is the 4231 we will end up playing then looking at depth of squad*:
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Gk - Albinson, Mutch
RB - Ahui, McCalister, Watret
LB - Reading, McGinty, Musonda
CB - Stanger, McGinty, Musonda, McCalister
CM - Dempsey, Syla, Smith, Donnelly Murdoch
LAM - Murphy, Amartey, McGeady, McKenzie
RAM - Chalmers, McGeady, Amartey Tomlinson, McKenzie
CAM - McGeady, Murphy, Chalmers
ST - Dowds, Rose, McKenzie, Bryden, Amartey
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We need another centre mid as the priority, probably one to start games. We need a CAM as we don't actually have anyone adequate to play there.
We are ok for cover everywhere else except left back, so any third signing should either be someone a little bit different or someone to come in that can do a competent job at left back.