Real Madrid forward, Cristiano Ronaldo, aggravated a leg muscle injury in Saturday's 2-1 win over rival Atletico
The Portuguese star was substituted with around 20 minutes left in the match in Calderon after aggravating a leg muscle injury.
Ronaldo will undergo tests to determine the seriousness of the injury, Real Madrid said on their website.
He suffered the original injury during the club's 7-0 drubbing of Malaga on 3 March.
It is not clear whether he will be able to join the Portuguese squad for the friendly internationals against Chile and Finland later this month.
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