Casillas broke his hand during the 1-1 draw with Valencia in the Copa del Rey earlier this week.
Real are set to face United in the Champions League next month and Barcelona in the Copa del Rey semi final.
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Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.