Milner in the front three is an option, but not one I'd do - as I think he's a much better left back than Moreno.
Big boost Henderson is back.
I think Klopp will do one of two things (assuming Matip isn't ready to start):
4-3-3:
Mignolet, Clyne, Lovren, Klavan, Milner, Henderson, Wijnaldum, Lallana, Firmino (right), Origi (central) & Coutinho.
or
4-3-3:
Mignolet, Clyne, Lovren, Klavan, Milner, Henderson, Wijnaldum, Can, Lallana, Firmino (central) & Coutinho.
I personally rather he didn't do either. As I want to see Lallana in CM & I don't want to see either of Origi or Firmino wide. My preference of the two would be the first formation though, as Lallana for me has to be in CM. I think if it is 4-3-3 and both Origi and Firmino do start, then Firmno will be the wide player, not Origi - based on what we've seen this season.
I'd like to see:
4-4-2 (diamond)
Mignolet, Clyne, Lovren, Klavan, Milner, Henderson, Wijnaldum, Lallana, Coutinho, Firmino & Origi.