The 28-year-old has one year left on his current deal after joining the club from Udinese in 2012, winning four Serie A titles. He has endured a troublesome knee injury, limiting him to a handful of games this season.
“He’s happy, because he’s finally getting better and playing more,” Pastorello told Tuttosport.
“I won’t rule out that Asamoah could renew [his contract since it's coming to an end next season],” he added.
“Patrice was the first to know that Juventus would fight for the Champions League. He made a personal choice to leave and he doesn’t regret it. At age 35, he needed to be a leader on the pitch and not just in the dressing room.
“He’s so connected to them that I wouldn’t be surprised to see him in Cardiff cheering for Juve if they were to make the final. Maybe he’ll also start taking coaching notes. Trust me, Patrice will be a top coach.
Pastorello also admitted that Asamoah's Juventus are favourite as they face Monaco in the semi-finals of the Uefa Champions League.
“Monaco-Juventus? The Bianconeri are favourites, but they need to make sure they don’t underestimate Monaco. That’s what [Manchester] City did and they went out.”
Asamoah has made 15 league appearances for Juventus this season, with a cameo appearance as the Old Lady eliminated Barcelona in the quarterfinals of the Champions League.