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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.