Willian says his former Chelsea manager was the most impressive he worked under, and praised the now-Tottenham boss for the impact he had on his game.
"I always say that the best coach I had was Mourinho," he said.
"I think I learned a lot from him, he was a coach that gave me a lot of confidence when I was coming from Russia. Arriving at Chelsea with many players in my position, there were a lot of players in front of me and he ended up betting on me.
"And I learned a lot from him on a daily basis, the way he gives the meetings. The way he speaks. Even the way to encourage players too."