If everyone currently in the squad stays, it will be very hard to pick an 18 man squad. I think our strongest may look like:
Trent Lovren VanDijk Robertson
Fabinho Hendo Keita
Salah Firmino Mane
SUBS: Mignolet, Gomez, Moreno, Wijnaldum, Milner, Lallana, Sturridge.
That's leaving out a lot of players (Karius, Clyne, Matip, Klavan, Grujic, Origi, etc)