The 24-year-old Italy international is having his best season in Spain and has scored 15 goals in La Liga for the Yellow Submarine.
“Juve have sounded out the ground, as is usual for a big club in this period,” Pastorello told Tuttosport.
“There was an offer, more precisely for a loan with an option to buy and Villarreal rejected it. But since then several things have happened.”
Asked if he is referring to a reported €30m bid from Tottenham, Pastorello said: “And not just that. I am also referring to the explosion of the player.
“It seems normal that an ambitious project like Juventus' marries well with Rossi's identikit. He is obviously a youngster of great talent with a winning mentality.
“If Giuseppe is Juventus' first choice or not is something only the directors know.”