City thrashed Burton Albion 9-0 in the first-leg of their semifinal, leaving the tie beyond doubt.
Guardiola said: "The result was good and of course we are already in the final but we have to play the second leg. We will take it seriously. Burton have had an incredible tournament. They have to be so proud, they did so well.
"Strikers need to score goals, Gabriel Jesus has had chances in the last few games and today he has scored. He is so important.
"It is not easy to play this type of game against a lower team, we made good runs in behind and we took it seriously. After the second and third goal it was easier, we were faster and quicker.
"I am off for a glass of wine with Nigel Clough, I know how important his father was for English football, he was a genius. Incredible. It will be a pleasure to share some minutes with him."