Casillas, dropped for the second game in a row, came off the bench early on to replace sent off goalkeeper Antonio Adan.
Real were eventually able to see off the challenge of Real Sociedad 4-3.
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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.