I don't think we should rotate too heavily for this. Away at West Brom is a considerably tougher game than rock-bottom Crystal Palace at home on Saturday. There's no point in making life too difficult for ourselves in a knock-out tie. If Yaya is available for selection i'd go with this:
-------------------Bravo----------------------
Danilo --- Stones --- Mangala --- Mendy
-------------------Toure----------------------
----------B. Silva---------De Bruyne-------
Sterling----------Jesus----------------Sane
(Subs: Ederson, Walker, Kompany, Delph, Gundogan, Diaz, Aguero)
If Toure isn't ready yet, maybe give Gundogan a start and have Fernandinho on the bench. Get Diaz on for Sterling at some point. Then on Saturday, revert back to a team similar to the one that started against Watford, but make sure Foden is on the bench to make his debut if we get to a point where we're comfortably ahead.
-------------------Bravo----------------------
Danilo --- Stones --- Mangala --- Mendy
-------------------Toure----------------------
----------B. Silva---------De Bruyne-------
Sterling----------Jesus----------------Sane
(Subs: Ederson, Walker, Kompany, Delph, Gundogan, Diaz, Aguero)
If Toure isn't ready yet, maybe give Gundogan a start and have Fernandinho on the bench. Get Diaz on for Sterling at some point. Then on Saturday, revert back to a team similar to the one that started against Watford, but make sure Foden is on the bench to make his debut if we get to a point where we're comfortably ahead.