The Brazilian defender's Chelsea future seems uncertain after losing his regular place amid a troubled relationship with boss Antonio Conte.
But Luiz, 31, is still baffled at rumours he might join Porto, who finished seven points clear of runners-up Benfica in Primeira Liga.
He posted an Instagram message saying: “The history of FC Porto is more of a newspaper lie, the same ones that ask for interviews many times !! Haha. BENFICA always in the heart !!!”
The former Paris Saint-Germain centre-back returned to Stamford Bridge for £34million two years ago.
But last term was blighted by injuries and issues with Conte.
Luiz was left out of Brazil's World Cup squad after winning 56 caps.
Centre-back David Luiz says he still feels an attachment for Benfica, where he spent four years, so would rule out joining their big Portuguese rivals Porto