Luiz's agent, Giuliano Bertolucci, has maintained regular contact with Barca president Sandro Rosell this season.
And Luiz told Sport: "I'd be a fool if I said I know nothing. I am aware, not least because for months there's been persistent rumors talking about the possible interest of Barca.
"What I can confirm is I have not negotiated anything and nobody has sent me a firm offer. I am a Chelsea player 100 percent.