Giaccherini quit Juve in the summer for the Black Cats.
"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.”
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