Did Ivanovic play in a back 4 or back 3 at Zenit? If a 4 then suggests he can still cut it. If a 3 then we almost certainly need to employ that to shoe horn him in.
Personally, I think a back 3 will almost always turn into a back 5 and negate the strengths of Pereira and Diangana, whose best performances tend to have been in a 433.
Could see Galagher dropping into a midfield 3, with Sawyers and Livermore, with Pereira, Diangana and Robinson interchanging in the front 3. Would be perfect for the Championship but, whilst it could have flashes of brilliance it would likely leave us exposed at the back.
Just shows how difficult this league is. It's not just who to play but how?