Madrid midfielderToni Kroos sprains knee ligament
The Spanish club says tests revealed Kroos has a sprained ligament in his knee.
It did not give an estimated time of recovery.
Kroos is a first-choice player. He played all 90-plus minutes on Wednesday in the 3-1 victory over Paris Saint-Germain in the Champions League.
The second leg of their round-of-16 tie is on March 6.
Madrid's match at Real Betis on Sunday is the first of three Spanish league games in a span of seven days. It visits Leganes on Wednesday and hosts Alaves on Feb. 24.