I’m not convinced we do ‘need’ to shift one. As you say, Bissouma is a CM by trade and Mooy and Lallana can play deeper too.
I’m assuming the final 25 man squad will look like:
3 Goalkeepers
5 Centrebacks (with at least 1 who can cover FB)
4 Fullbacks
5 Midfielders (including Mooy & Crofts**)
4 Attack Mids / wingers
4 CFs*
Under 23’s are free and don’t need to be counted towards the 25. *Unless 2 new strikers are bought / loaned in Connolly frees up a squad slot too. Will an injured Andone be included? The other areas are full and already have additional U23 players as cover. If a new AM / winger comes in then I can see one of Gross, March, Jahanbakhsh, Izzy or Mooy leaving unless they take up a striker’s squad place. **Crofts slot will be replaced by the incoming Lallana.
I’m assuming the squad will look like this:
3 Goalkeepers
5 Centrebacks (with 2 who can cover FB and 1 who can cover DM)
2 Fullbacks
1 Utility Player (Full Back, DM & Winger)
3 Central/Defensive Midfielders
6 Attack Mids / Wingers
4 CFs