The Real Madrid legend has spoken of his desire to enter coaching in an interview with Portuguese weekly Expresso.
When asked if he would like to be a goalkeeping coach, the Porto number one responded: “No, if you want to be a coach, then you should not only train goalkeepers, you have to pass on your knowledge to all players.
"In my case, I was lucky to have experienced a lot and it would be good to pass on [my experience] to all players."
Casillas also praised his Porto coach Sergio Conceição.
"He is very demanding, he wants his players to give their best, to give 100 percent… or more… 120 percent," he said.