Luiz, 25, has impressed by operating in midfield as well as defence during Chelsea's so-so campaign.
The shaggy-haired Brazilian said: "I'm happy that a club such as Barcelona is interested in me. They're a team of winners and their interest is a source of pride for me.
"I'm a Chelsea player for now. I work hard every day to make people appreciate what I do.
"I try to do my job in the best way possible, wherever I am."