Real Madrid fear goalkeeper Thibaut Courtois could miss BOTH legs of their Champions League quarterfinal against Chelsea.

Courtois could miss up to a month of action after suffering an injury on international duty with Belgium, says Sport.

Courtois, 30, picked up a knock during Belgium's 3-0 win over Sweden on Friday in the opening game of their Euro 2024 qualifying campaign.

He played the full 90 minutes, but Courtois left the camp on Sunday in a precautionary move after straining an adductor muscle, according to the Belgian FA.

Real now fear the injury could keep Courtois out for between three to four weeks.

They face Barca in the second leg of the Copa Del Rey semi-final after losing the first leg 1-0.

Courtois could also miss both legs of their Champions League quarter-final against Chelsea - the keeper's former club.

It is the Belgian's third injury of the season and he is likely to be replaced by back-up stopper Andriy Lunin.