But Castellini told TMW: "From the outside, he was a bit unlucky. He unconvincingly came out, however, the Italian league is also very difficult and it's an error if you think you'll coast.
"Hart will understand that it is not easy being a goalkeeper here, I can only wish him the best.
"No, the value of Hart is everything he proves Sunday to Sunday. But yes, it was no more than an initial incident. He has time to prove himself."