My best guess now would be:
Karius
Mignolet
Clyne Matip Sakho Moreno
Flanagan Lovren Klavan? Chillwell?
Can
Stewart
Henderson Wijnaldum?
Milner Karius
Mane Coutinho
Markovic Lallana
Sturridge
Origi
Firmino
Ings
At the moment I personally still think Lucas is required as I don't trust Stewart to cover for Can but not sure Klopp agrees. I suspect Markovic will leave making way for Ojo but not ready to exclude Lazar from thinking either yet. Ilori, Gomez, Ojo also floating around the squad outside this group. Alberto, Smith, Allen, Benteke, Balotelli, Wisdom, Bogdon the players I would move on.
I take it you meant Grujic under Wijnaldum? Agree with the idea. If we want to play 4-2-3-1, we can quite easily make the switch too. For me, that's still our best option, if we field:
Karius - Clyne, Matip, Sakho, Moreno - Can, Henderson - Mane, Firmino, Coutinho - Sturridge
Subs: Mignolet, Lovren, Flanagan, Lucas, Milner, Lallana and Benteke. Then we could fill up with Ward, Gomez, Smith, Ilori, Brannagan, Stewart, Ojo etc.
If we plan to go 4-3-3, it's the same back four, the same front four minus Firmino/Sturridge. In CM we could still opt for Can, MIlner, Henderson. Like you, I could see the point in hanging on to Markovic, but I'm not convinced we will. I think it's clear that we'll sign a new LB and since I included Benteke, I wouldn't be surprised to see a new first pick striker arrive. Because everyone knows Benteke is off. A possible solution is to shift Markovic and get someone like Goetze, who can play in more positions. Don't think that's the best option, but it's one way to deal with things. That would perhaps not make us so much sharper, but it would define the roles for Ings and Origi better.
There's one more thing I miss from that team and it's a new first pick CM. The CMs we have now don't impress me. It's not bad, but nor great and we have too many options. It's really only Can I feel we'll see every week. Wijnaldum, I can't say I've seen a great deal of him, but why him for CM when we have Henderson? I don't get it.
For me it's still 4-2-3-1 when everyone is back fit. The likely scenario going forward is still lots of exits and 2-3 new signings. Those signings though, they need to be real improvements on the 11. Going back a few years in time, Riise/Aurelio, Alonso/Mascherano and Torres/Suarez should give us an indication of what level we should be looking for.