Id honestly wouldnt play Shaqiri and go with Keita instead for the pressing and defensive tasks.
Yes, but if we have Fabinho, Henderson & Gini as our midfield, do we really need more players to do complete defensive tasks? Yes, Shaqiri might have to drop back every now & then and do his share of work, but he'll have Henderson & Trent to help him out on his side. I'd put Shaqiri right and Salah central & play the same way we have been of late & it's not as bad an option as it sounds, if you see what I mean.
The only thing that makes it against this happening is how less Shaqiri has played in the 2nd half of this season, otherwise he looked bright when he came on with Ox yesterday.
The thing that goes against Keita playing (not in midfield instead of one of the three, which would be justified considering his good form, but as the 4th midfielder) would be that, then we'd have too many midfielders doing too many similar things on the pitch. Would that mean enough threat in attack in a game where we need away goals?