However, former Santiago Bernabeu midfielder Granero suggests there is more to it than that, especially seeing as the best goalkeeper in the world is sitting on the bench.
"It's hard to judge from the outside," Granero told AS. "Obviously there is a conflict.
"I know Iker very well and he is the best goalkeeper in the world. He is the captain of the team and has lifted the World Cup and the European Championship twice.
"He is a symbol of Real Madrid. He has spent 20 years at the club and to me has always been an example.
"I am not the coach who evaluates the status of each player. You can say Diego Lopez has done nothing to not deserve this spot. I have seen him train like crazy in his life. He is very professional.
"But Casillas is Casillas and he is the undisputed starter. The coach is smart enough and professional enough to choose on form."