Asked if he can go on to play for Roy Hodgson's team, having represented the national team at Under 16 to Under 19 level, Pochettino replied: 'Why not? It is impossible to set the limit for him as he is 18 and is very strong. His quality is amazing and he only needs to work hard and then he'll be fine.
'He is a special boy, a special player, because of his talent, his potential and his body. His body is powerful and he has quality in his feet. I don't know how he will develop.
'Sometimes you get an instinct about a player but I prefer to keep that inside. Football is always about input and feeling and sometimes you don't know why but you think this guy can be a top player.
'Maybe it is about knowledge about football as we have been in football all our life. I think we have a lot of talent here.'
Pochettino is convinced that his methods of subtly integrating academy players with the first team helps them to put in such confidence performances when they are called upon, like Onomah did last week.
He added: 'The problem with the young players is that they play in the U21 and U18 and you pick them one day and it is normal that it is very difficult for them.
Our process is to work with the academy and train, it is a natural progression to train with the first team and when they play they feel very confident and play like they do in the academy games.'