Centre back a must. The gap between our starters and the bench in that position is collosal and, given the critical nature of the position, therefore carries the greatest area of risk to results if Tarks or Branners get injured. Would be my priority. As for the profile of signing, has to be either a top quality old pro on a short-term deal (something along the lines of that Evans to United deal) or a young player with a high ceiling from the championship. We live in hope.
Centre midfield I also agree is next on the list. Profile has to be someone who can come in and compete immediately in the engine room. Fancy a loan, me. Phillips would be class. Maybe Hojberg from Spurs.
Rest can be left alone. Feel like we have good enough cover at Right and Left Midfield (we don't play wingers) in Harrison, McNeill and Danjuma. Most of that front lot can play multiple positions for a Dyche team, Garner and Doucs have also put in stints there.