It is rumoured in the paddock that Fernando Alonso could quit Formula 1 or the beleaguered British team at the end of the year.
Daniel Ricciardo and now Raikkonen have been linked with the seat.
McLaren executive Brown told Finland's C More: "We did not negotiate with Kimi.
"He's a very good driver. The summer is now underway, so there's a lot of options out there, but we keep them to ourself.
"Certainly Kimi is a world champion and he won many races for us. If he is available, you'd be a fool to ignore it."
The 2018 calendar continues tomorrow with the British Grand Prix.