Manchester City boss Sven Goran Eriksson is keeping a close eye on the club's best Academy talent.
The former England manager enjoyed the experience and predicts a bright future for some of the boys.
He said: "It was a marvellous victory, and they played very good football.
"Millwall were the better team for 20 minutes and went ahead. Then suddenly everything changed, and we scored five beautiful goals.
"The academy is working very well. There are players in that team who will train here (at Carrington) soon and then progress to the first team. The quality we have is very good."