The player’s club Real Madrid said yesterday that he had been diagnosed with sacroiliitis – inflammation of one or both sacroiliac joints in the area where the lower back and pelvis meet.

“The medical staff of Real Madrid and the Royal Belgian Football Association have discussed Thibaut Courtois’ back problems intensively in the past period,” the Belgian association added in a statement.

“Both medical staffs have come to the conclusion that the goalkeeper is not fit for the upcoming internationals.”

The injury may also jeopardise Courtois’ chances of playing at the Club World Cup in the US, where Real Madrid open their campaign in Miami on June 18 against Al Hilal from Saudi Arabia.

Uncapped Nordin Jackers from Club Brugge will replace Courtois in the Belgium squad for the matches against North Macedonia in Skopje on Friday and at home to Wales next Monday.

Nottingham Forest goalkeeper Matz Sels is expected to take Courtois’ place in goal for the two Group J fixtures.