We tend to play with a front 4: Rooney, someone behind Rooney and 2 wingers.
If we have taken in Christie, Maloney, Stewart and are targeting the signing of another winger on top of that (as per McInnes), you'd think if McLean stays then he'll find himself playing a bit deeper. When he played deeper last season to accommodate Maddison, he was largely ineffective.
If he is willing to sign a new contract then great, but if not, we need to sell now and use the funds to sign a high quality defensive midfielder to either allow Shinnie to move back to left back or play instead of Tansey if he's not up to it.
I think Christie is more likely to find himself out wide with Maloney playing behind Rooney.