Martinez expects the striker to take the top flight by storm following his summer loan move to Tottenham.
He said: "He is getting better and better from every experience he accumulates. Going to Real Madrid has taken him to a better level.
"As a player you are as good as your experiences. He has been in a very demanding club. Believe me it is 24 hours you need to be at your best. You cannot afford to be sloppy.
"In Emmanuel's case, to maintain everything without dropping his standards makes him a much better player.''