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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.