He told arsenal.com: "He was 15 [when he first impressed] he's 16 and last year a few times I integrated him in our [first team] training sessions. He didn't look at all out of place. Straight away football was natural for him.
"He is a quiet boy, very determined, very focused. The talent is there you have seen that again tonight. It is always difficult when you are the manager of a boy with talent like that you are always a little bit cautious to put too much pressure on him and too high a level of expectation. I believe it is all in there and that I have the responsibilities to nurture him and to get him at the right moment and the right development in the next two or three years. 16 to 19 is very important age for the development of a football player. At the moment he has skipped a few classes.
"People tell me his a little bit like Liam Brady because of he has good balance and change of direction. I don't know well enough Liam.
"I believe later [in his career] he will be a central midfielder or behind the strikers."