Mourinho interviewed for the Barca job before they went with Pep Guardiola over three years ago.
"Mourinho has a capacity to adapt very well to all cultures. Porto, for Mourinho, was one, then Chelsea was different. And Inter Milan has nothing to do with the others. And in Madrid this is another where he's doing well," said the Portuguese.
"For me, Mourinho is the best coach in the world. He is very special."