The 20-year-old impressed for Brazil in the U20 World Championships in Egypt earlier this year.
Kardec is currently on loan from Vasco da Gama to Internacional.
Fiorentina, Spartak Moscow and Juventus are also reported to being interested in the youngster.
His agent earlier this week told Tuttosport: “I know of Juventus’ interest and he can move as early as January. The price? €5 million.”
