For many, both midfielders are essential for City.
Platt said: "They're not indispensable, we have to look at things.
"We want to get to a point where nobody is indispensable. What we know with Yaya, he can give us so much balance, so much control of the game - a lot goes through him.
"With David, when you think you are coming up against a tight defence, he can open things up with his ability.
"We address every game as it comes, with one eye on what the players have done and what the players are going to have to do in the next game.
"A lot is made of people missing games but we don't just pick a team for one particular game."