Belgium coach Roberto Martinez is delighted seeing the progress of Real Madrid goalkeeper Thibaut Courtois.

Martinez was speaking ahead of his side's upcoming Nations League game against Wales. He believes Courtois has grown a lot since the last World Cup.

"He's on top of the world," said Martinez of Courtois.

"He's in that moment of maturity."

Martinez chose to highlight an incredible stat which shows just how valuable Courtois can be to club and country.

In the Champions League, the Real Madrid no.1 has stopped 24 of the last 25 shots he's faced.

Martinez believes that the 30-year-old's growth in recent years is a lot down to the mental side of the game, where he believes he has improved greatly.

"At the World Cup in Russia in 2018, he was chosen as the best goalkeeper and since then he has grown a lot in the mental side of things," said Martinez.

"The human side hasn't changed, but he's a player who's on top of the world and of his game."