We've got two players for every position (almost). I'm pretty sure that we'll take every competition very seriously until forced to compromise if a fixture clashes just before a league game, and then we'll just give it our best shot with what we have.
If we can choose between Sane, Sterling, Jesus, Bernardo, David Silva, De Bruyne, Mahrez, Foden we don't have to make compromises we just have to rotate.
Do City have a best 11? We have a No. 1 keeper, and 5-6 players such as Fern, KDB, Laporte, Walker, Sane, David Silva would get into a best 11, but this is a squad in a very real sense.