Following news the Liga giants have lodged a €25 million bid for the versatile Brazilian, the Blues manager has underlined the defender's importance within his squad
Goal understands the Liga giants have lodged a €25 million offer for the 26-year-old as they continue to look for a long-term replacement for Carles Puyol, after being thwarted in their attempts to sign Thiago Silva from Paris Saint-Germain and Marquinos from Roma, who joined the French champions.
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"I have known of David Luiz from the very beginning so I know him very, very well," Mourinho is quoted as saying by The Sun. "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.
"He can improve, especially defensively. He can be much more effective, much more solid. But the potential he has is amazing, incredible."
Liverpool centre-back Daniel Agger is another target for Barcelona, with Danish media suggesting a €20m bid could be in the offing.