Luis admits being left frustrated after the final season they had together at Chelsea.
He recalled to the Daily Mail: "When I was on the bench for the first game of the season I knocked on Mourinho's office door and said: 'Why did you bring me here? Why didn't you just leave me at Atletico?'
"He said that he didn't feel as secure defensively with me in the team as he did with Azpilicueta.
"He said I had to win my place. I couldn't expect that because of my name I was going to be first choice.
"He was right. I wasn't playing well. But I also think you have to be on the pitch to improve.
"I never regretted the move because I was at one of the biggest clubs in the world but everyone wants to play!"
His decision to leave came when he was left out of the League Cup final having played all the games in that cup run.
"At the time I felt betrayed for want of a better word. I did not want to work for Mourinho for another year. But it was not his fault. We won the final and I have the medal at home!"