Mata was writing in his blog just hours after defeat to Liverpool.
"The storm will pass and the sun will rise again," he wrote. "I have no doubt.
"Besides, no one said this would be easy, but this is football. It gives you fantastic moments but also very hard times you have to cope with, when you have to show pride and professionalism until the end.
"And when all this is gone I'm sure I will be a more mature footballer."
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