"That was fantasy football, and this is the same."
Buffon, who once again proved why he is rated as one of the world's best goalkeepers on Saturday as Italy beat Cyprus in World Cup qualifying, is reportedly a £56million target for City.
But Gigli insisted the 30-year-old remains a key figure at Juve.
He added: "Buffon's price doesn't interest me, what interests me is to have him with us as a man, as a sportsman and as a lynchpin at Juventus.
"And I am happy that he helped Italy beat Cyprus."