Guardiola told reporters: "Take a look at our games and you realise. It is simple. He is so important for the quality he gives us. But if you have a player that doesn't want to play, he won't play. I need to rest the centre halves also but in [England's] friendly games, [John Stones and Kyle Walker] got injured so they get cannot rest. We are in big, big trouble. I had the feeling we were tired in the last games. We will decide [on Saturday] what we have to do."