Turnbull can't really be expected to do much for us this season given his injury lay off and lack of fitness and in my opinion Maguire should be ahead of Semple or Cornelius if there is a midfield spot in the team.
If we are bringing someone in we need a midfielder that is comfortable on the ball, has a bit of vision and grafts. Tough ask but its what is needed.
We could also do with a target man style forward because Scott is better coming in from wide areas and Long can't hold the ball up. The right back area is a position that needs improve but perhaps isn't as pressing as the other areas mentioned right at this moment.