The England midfielder was taken off on 58 minutes in yesterday's FA Cup semifinal win against Southampton.
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Asked about Foden afterwards, Guardiola said: "Question of a little bit of time.
"It was not easy in the first half for him because we were playing in the pockets and his position was being man-marked. For a full-back it is not easy to find him.
"It is a question of time when he will be back."
Asked if he had faith in Foden, Guardiola simply replied: "Absolutely."