Manchester City boss Manuel Pellegrini says Kelechi Iheanacho's emergence is proof their youth system is working.

Pellegrini insists age is just a number for those wanting to break into the first team.

"It's important for everyone, for the club who invested a lot of money in the training ground," he said.

"The media are always criticising us for spending so it is important to bring young players through. I'm sure next year other players will arrive also. The door isn't closed because they are young."