Nunez worked with Mourinho at Barca when the Special One was an assistant to Sir Bobby Robson.
"Towards Mourinho I have only words of thanks. He was a great collaborator with Bobby Robson. If I made a mistake it was letting him leave Barcelona because with (Louis) Van Gaal we won two league titles and the third we did not win when Mourinho went to Porto and became European champion.
"He has always been very good to me, he has been very faithful."