The striker signed for Juve on Monday from AC Milan.
"It's a great feeling to be back, as I saw many old friends again, I'm back with a group I already knew and felt very comfortable with," he told the official Juventus website.
"I am happy to be here and hope to be able to help the team. I've found a very strong team with fantastic players, which is exactly what I left.
"The Coach has accompanied me for most of my career, he helped me grow up at Cagliari, we met again at Milan and now here. I want to do well for him as well as for Juve.
"It's the usual Juve, top of the table and strong. The team has been reinforced compared to previous years. There are all the elements needed to do well.
"When I left, I had become very fond of the group, their desire to win and the friendship that had been created. On the field we were 22 lions and off it all friends."
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