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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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.