I'd be slightly wary of playing Keita in this, after the recent league game there and some of the 'attention' he got from players and fans. He should be emerging as a key player for us in the coming games, bedded into Klopp's way of playing, a run of games against weaker opposition that we'll need to attack and break down. An injury or suspension from a rash reaction here wouldn't be too helpful.
We could rotate heavily in the midfield/forward areas without him; Sturridge, Origi, Shaqiri and Lallana ahead of a midfield two, for example. Wijnaldum and Milner looked the most fatigued on Thursday, though Milner came off earlier and probably isn't as key for the coming league game(s) so might still be used - possibly at RB. Of those that started at the Etihad, Henderson probably has the legs for this if necessary and Fabinho will play somewhere. Moreno at LB, and tend to agree with SG that Lovren/Van Dijk should be able to play this, given the lack of real alternatives. If we were to play a 16 year old, or give Fabinho a game at CB, you'd probably want either to be partnered by VVD rather than Lovren.
Trent, Robertson and Wijnaldum shouldn't be involved. Ideally, none of the front three would be either, but Klopp tends to prefer one of them even in such games. Mane, possibly, though in all likelihood it will be the indestructible Bobby.