Mourinho says "I have known of David Luiz from the very beginning so I know him very, very well.
"And before I came back to Chelsea, I watched him week after week.
"I see him as a centre-back because he has an important quality for a footballer - he can build from the back.
"He is very comfortable and confident with using the ball from the back - he does not play direct.
"And he can improve, especially defensively. He can be much more effective, much more solid. But the potential he has is amazing, incredible."
