Real Madrid on Wednesday said that Kylian Mbappe had suffered a knee sprain, delivering a blow to their bid to reel in La Liga leaders Barcelona.

"After the tests carried out today on our player Kylian Mbappe by Real Madrid's medical services, he was diagnosed with a sprain in his left knee. Awaiting evolution," the club said in a statement.

Real Madrid did not indicate how long the 27-year-old striker would be out for, but a source close to the France superstar said he would be absent for at least three weeks.

Mbappe is therefore a major doubt for Sunday's league match at home to Real Betis, Los Merengues' first after the winter break as they trail Barcelona by four points.

He could also miss the Spanish Super Cup semi-final against arch-rivals Atletico Madrid in Saudi Arabia on January 8, as well as a league fixture against Levante and a Champions League clash with former club Monaco.

Mbappe has enjoyed a stellar 2025, equalling Cristiano Ronaldo's club record 59 goals in a calendar year, and has at times carried Real Madrid, relieving some pressure on under-fire coach Xabi Alonso. (AFP)