The Citizens were beaten in the Champions League quarter finals by Real Madrid on penalties on Wednesday night.
However, Guardiola knows they must respond quickly, as they take on Chelsea in the FA Cup semi final on Saturday.
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We have no other option," he said on getting over the Champions League exit.
We can't feel sorry for ourselves. In football you lose games. We performed at our best and we could not win.
We will reflect in the summer about what happened during the season. You compete to win.
It hasn't happened many times in the last seasons but sometimes you lose games. That's what happened."