the thing is even though they release their players my fear is they might not be able to replace them with same quality of players without breaking the bank
What? Are you joking? As long as you have money, you can also get new players in Mbappe or Vini's calibre. Why are you doubting City's chance to sign quality players when they have very very big resources to be spent?
Any quality players they will sign always cost them so much money. They can build up the new winning team with their money, and no doubting it.
Waiting for Pep to introduce his list of players to sign in summer.