Guardiola was forced to field a number of youngsters for Thursday's 2-1 win over Bournemouth, with teenager Liam Delap scoring on debut.
"It was a good game, but all our young players played at a high level, Tommy, Taylor, Liam. All of them were really good," Guardiola said post-match.
"At 17 years old, Liam is a different striker to what we have in terms of physicality. We see in training how good a finisher he is. Now is the time to be calm and keep working. We are delighted with his performance. He played really well.
"With the situation we have right now, we need players from the academy. We have just 13 players fit. With the problems we have up front, he will stay with us. We will use him.
"We cannot forget, like with Phil, he is only 17 years-old. He has a lot of things to improve. We cannot anticipate the progress of every young player.
"We've had Phil, Eric, Liam and we have Cole Palmer, who will be an exceptional player.
"We congratulate the academy. I am the last step, but before there are a lot of people in the club working for this and it is a big success for them. Jason Wilcox is the academy boss who helps us have these players. That's why you have the Academy. When you need players we can use it. It depends on the quality of the player.
"When they have desire, work ethic and the quality is good, they will have chances. Tommy played incredibly well as a holding midfield. Taylor as well. These guys did not play one game of the last three months."