The 25-year-old will be sidelined either for two or three weeks, thus will definitely miss El Clasico that takes place on May 3rd.

The Dutch international picked up the injury in Real's 3-2 win over Getafe in the Primera Liga on Tuesday, and was substituted only after 18 minutes as a result.

Robben's unavailability for the next fortnight is perceived to be a major blow for the Spanish champions, whose hopes of retaining the domestic title depend on the upcoming few games.

Real, who lie second in the league table with 75 points, will also have to do without their influential wide man in their crucial trip to Sevilla on Sunday.

Barcelona, on the other hand, are three points clear on top of the table and are widely considered favorites to win this season's title.