Not sure how they'd fit him in though.
He's best as a CAM. Can't really play on the wing or as a CM.
Does that mean Klopp will switch to a 4231? If he does I sense Liverpool might actually play in a quasi-4222, as Fekir is your quintessential CAM, not a CM playing as a CAM. That might cause problems in terms of numerical superiority in the midfield, is the running power of a Keita enough to compensate?
You make a good point. They seem to have found a really good balance in that team recently. The difficulty for them will be to improve the quality without upsetting the balance. For instance Coutinho was certainly a better quality player but their balance actually improved without him.