The Italian International signed for the Black Cats in July and admits that while it was difficult to leave the Serie A champions, he is enjoying life in England.
"It was hard to leave Juventus, but it was to the economical benefit of everyone – myself and the club," he told Radio Mana Sport.
"I left a great team behind, but I'm happy with the moment I am living through. It's a beautiful experience which I wanted.
"The English game remains physical and less tactical, but there is a lot less pressure around it."
Sunderland have endured a tough start to the season and are currently 19th in the Premier League table, having picked up seven points from their first 11 games.