Marcelo could be out of Real Madrid's Champions League semi-final clashes with Borussia Dortmund.
The Brazilian full-back was stretchered out of Los Blancos' 3-1 win over Real Betis on Saturday evening with a hamstring injury.
And AS have claimed that the defender will miss the next three weeks, meaning he will be unavailable for both legs of the last four tie with the Bundesliga side.
There is also concern over Luka Modric, who complained of a calf problem yesterday, and may be out for the next 10 days.
Play and compete for prizes in the world's most entertaining Fantasy Football Game. Select your favourite players from Europe's top 5 leagues, including Messi, Ronaldo, David Silva and Pepe Reina.