A first-half strike from Phil Foden fired us ahead before Savinho settled the tie with a fierce hit from a tight angle.
City dominated with almost 80% of possession and the boss was pleased with the patience of his side although there is still aspects that can be improved.
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“Maybe it was hard because you expect 0-10 maybe, but football doesn’t’ work like that,” Guardiola said.
“I think we played a really good performance and defensively we improved a lot.
“Respect the last game against Arsenal and with the ball of course they allowed us to make the process, it was good.
“We made maybe the final third pass or involved more crosses in the first half but we concede one chance in 89 minutes.
“I know all the time from my experience [over my] seasons that in the FA Cup, Carabao Cup, away in the Championship, League One, League Two, it’s always tricky. And always we behave really good.
“I’m happy for John [Stones] and Nathan [Ake] who played really good and all the other guys. The new ones and the old ones, they perform in the way we try to define ourselves as a team.”