I'd say it's a fairly close call between the keepers (Baz and Kelleher I mean) - I'd expect they'll get 1 game each over these friendlies.
Good to see Szmodics on board, 27 goals this season for a struggling Blackburn side is impressive. I watched him the other night against Newcastle and he looked quite potent. A small lad (5'6), I'd expect to see him play off Ferguson/Idah if we go 4-4-2, but I assume he can do a job cutting in off the flanks too.
baz/kells
doherty collins o'shea scales
cullen knight
ogbene szmodics johnston
Ferguson
in a 5-3-2 it becomes more difficult to fit in the attacking/form players (i.e. szmodics, ogbene and johnston).
baz/kells
doherty collins obam o'shea scales
ogbene cullen knight
szmodics/smallbone/johnston
Ferguson
I think reverting to a back 4 might make sense though the opposition is pretty decent. That said left back is a problem position which might lean itself towards a 5-3-2.