Pirlo says Pogba remains bitter over how he was treated at United.
He said: "All the interest in Pogba is of no surprise. When you put in great performances you get attention from the top clubs in Europe, it has always been that way.
He didn't feel he was treated well there. I know that was under Sir Alex Ferguson and now there is a new Coach, but I do not seeing him returning to a club where he was not treated well."