Mbappe is one of the hottest prospects in Europe after a stunning campaign with Monaco.
Manchester United, Arsenal, Real Madrid and Barcelona are all monitoring his situation.
The 18-year-old has scored 19 goals this season and made his France debut on Saturday against Luxembourg.
He replaced Dimitri Payet for the final 12 minutes in the 3-1 win and Henry is certain he will have a big future.
“I don’t like comparing players – Mbappe has to become Mbappe and that is all,” he told Canal Plus.
“But my word, he is good. Oh la la. l really like watching him play.
“When you have a kid with that much talent, what are you going to teach him apart from a few tactical things?
“So it is more [about saying] develop your brain and become a killer. Develop your brain, your intelligence and your movement. What can you see? When you watch a match, don’t just watch the ball, watch the movement off the ball.
“Understand quickly who is weak in the match, who you should attack and who you shouldn’t attack, how to attack this player and understand all of that.
“I met him and he gave me the impression that he has a good head on his shoulders.
“Yes, he is quick, but he is thinking and that is the sign of a kid who can go a long way in the game.”
