Paris Saint-Germain coach Thomas Tuchel believes Kylian Mbappé will become the best player in the world, but said the attacker still needed to improve.

Kid Mbappé will mature

Mbappé, 19, has made an impressive start to the season with 13 goals in 11 games for PSG.

But the teenager was questioned by Spain and Barcelona great Xavi, who said Mbappé still lacked "football maturity".

In response on Monday, Tuchel backed Xavi, but said it was normal that Mbappé still had room for improvement.

"It's normal for him to get better. He's 19," he told a news conference ahead of PSG's Champions League clash against Napoli.

"He's amazing. He's one of the best players in the world and he's going to be the best.

"Xavi is right. He needs to improve on everything, it's totally normal when you're 19."