Beating PSG in the Champions League on Wednesday was delightful for Real Madrid, but it is coming at a cost following the confirmation that midfielder, Toni Kroos is set for a spell on the sidelines with a knee injury.

Kroos, who did quite well in Madrid's 3-1 defeat of Paris Saint-Germain in the Champions League on Wednesday, has suffered a sprain to the exterior lateral ligament in his left knee.

Madrid have offered no timescale for Kroos' recovery but he is expected to miss Sunday's LaLiga trip to Real Betis, while he may be a doubt for the return trip to Paris on March 6.

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"Following tests carried out on Toni Kroos by the Sanitas Real Madrid Medical Services, he has been diagnosed with a sprained to the exterior lateral ligament in the left knee. His recovery will continue to be assessed" Madrid said in a statement released on Friday.

The Germany international has started 19 of Madrid's 22 league games so far this season, contributing four goals. 

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