The Brazil international says he immediately regretted leaving Atletico Madrid for Chelsea at the time.
He recalled: "When he put me on the bench in the first match I asked him: 'What did I come to do?'.
"But he explained to me that I had to earn the job, that my name did not guarantee ownership.
"I felt betrayed to say the least. I didn't want to spend another year with Mourinho..."
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