Often fielding five or more teenagers, City pushed Dortmund and Liverpool hard before beating Bayern Munich in Miami on Saturday evening..
The Catalan says his team developed the spirit of a lower league side, fighting together and battling against adversity.
“We have a lot of young guys and they played against Dortmund, Liverpool and Bayern - they are not simple teams and it is good for the future.
“They know I always play the guys who run and help them to understand the game. That is what I like the most: when I see a player fighting for his teammates, and when we play like a humble team - like a fourth division team.
“My career speaks for itself: we can play good or bad but having people who run - that is enough for me. After, we will improve.”
“You cannot imagine how much I have enjoyed these ten days with these guys. They are starving to become football players - they are hungry.
“When I say something, they open their eyes and listen to you. They have to make their career and we are here to help them. I told them: if all the guys here in training every single day are curious to know what happens, I will say thank you.
“Guys who don’t care, I don’t say thank you to. They did it - they are 17, 18, 19-year-old and what they have done and the way they have played makes me so happy to be the manager. It is a huge experience for them.
“We will see if they will step up and the physical conditions of those coming back. I saw many good things, but I will not say names. At that age, it can be something that confuses.
“I am happy for Phil Foden - he had an outstanding game today. Previously, it was not his perfect performance, but he did it tonight. When he does not play well, he is a fighter - he has the English mentality to not give up.
“Eric Garcia played three games and against Mane, Salah and Wagner. It is so complicated, but I am so satisfied. He was so good.
“Bayern are a big team and they were different in the box - so, so good. They have a big talent. I don’t think there was a big difference between the first and second halves - we never got down. It was humid and warm, and it is not easy to have high intensity in those conditions. I am so happy with my players.”