Pep Guardiola admits he will have to go through some pain if he is to lead Manchester City to Champions League glory.Guardiola's men meet English rivals Chelsea in Porto on Saturday to do battle for the biggest prize in club football.City have never known what it feels like to be crowned kings of Europe - and Guardiola has warned them that in order to do so, they will have to suffer first.The Spaniard, who last won the Champions League as a boss a decade ago with Barcelona, said: "Everyone wants to win, but sometimes you have to play one way and then have to adapt to circumstances."Some players go out and have more pressure and tension, while better players can struggle - but you have to handle it."The guys who can suffer, will suffer..
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