Mejias has just joined Middlesbrough on-loan.
"I wish the best to him (Casillas) and Diego," he told AS.
"They are two great goalkeepers. We did not think about it (rotation). The two are performing and contributing to the team.
"That tension is positive, keeps them alert. You cannot ever relax.
"At Madrid, all are great professionals. It is the highest level. If someone is not fully trained it is impossible."
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