City - who have seven wins from seven this season - had 23 shots at goal against the Bundesliga side.

"Considering the opponent, the pressure that we had, we played really, really good," added Guardiola, who watched on as Sergio Aguero scored the second-hat-trick of this campaign.

Guardiola, who has worked with strikers such as Lionel Messi, Samuel Eto'o, David Villa and Robert Lewandowski, said Aguero was "one of the best" when asked how the Argentine ranked out of those he has coached.

"He has a special quality in the box," added the Spaniard. "He's a special player."

City, second in Group C behind Barcelona - who beat Celtic 7-0 on Tuesday - on goal difference, also handed a debut to Ilkay Gundogan following his recovery from injury.

"After three or four months out injured, he played with such intelligence," said Guardiola. "He is an amazing player. He was dribbling, he arrived in the box at the right moment at the right tempo, we are so happy to have him here."