City meet Juventus on Thursday, needing a victory to finish top of their group.
On his players' commitment, Guardiola said: "Absolutely. We talked about that, that competition, seven games like the World Cup, or the European Cups, Copa America, the tactics are relatively important, but not massively.
"It’s how everyone pushes, it’s just five or six games, so make a real contribution, the body language.
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"We spoke at half-time about scoring as much as possible, but in the end we played against our opponent.
"Juventus play another opponent, they may do better than us, but now if we want to finish first, we have to beat the Italian team.
"If not and we’re second we’ll see who we play in the next round."