Guardiola was satisfied with the performance of his team after their Manchester derby victory.
"We made mistakes. We were punished but the fight, the togetherness, it is something we are building and are not going to lose that because of a defeat", he said. "A lot can happen in football, but we are scoring a lot of goals and creating a lot".
This season he's managed a single goal in eight EPL appearances, his overall tally in his new shade of red just four in 28 matches.
The front three of Jesse Lingard, Anthony Martial and Marcus Rashford were basically asked to hurt City with their pace, but they were often too far detached from the rest of the team to make use of their attributes.
A 44-pass move that allowed Ilkay Gundogan in to finish off the game in City's favour, a general malaise hung over a performance from Jose Mourinho's men that offered little or nothing to the tie as a whole.
Lukaku was introduced in the 57th minute, while Sanchez replaced Ander Herrera in the 73rd minute...
Guardiola later said he was unhappy with his side - "the first half was not so good" - for failing to press home its advantage, but early in the second half came a second goal.
"My heart says United will win 2-1 because they'll basically stay in the game and score two late goals after City failed to kill them off".
GK David De Gea, 6 - The Spanish global conceded from City's first two shots on target and will be unhappy to have been beaten at his near post by Aguero, though but there was a lot of power behind the effort. Mourinho blamed the European competition for United's collapse in the blue half of Manchester.
Juventus forward Paulo Dybala has insisted he did not insult Manchester United manager Jose Mourinho following their Champions League match in midweek. It is one thing to go to Juventus and play against one of the best teams in the world for 90 minutes. "For different reasons we miss Paul but that doesn't mean with Paul we win the game so that is not an excuse". At 2-1, to bring a fresh Fellaini to the pitch, I think they would be in big trouble.