Vucinic was on target during the 8-0 win over Lega Pro side Cuneo on Friday and had a hand in three other goals.
"There is so much enthusiasm in the air, both from the players and the fans," smiled the new 15m signing. "I have rediscovered my smile, which went missing lately at Roma, so I am very happy. I missed that feeling.
"I've been struck in the first few days of training by how easily the Coach and my teammates have allowed me to settle in. I feel like one of them already and am at their full disposal.
"It's wonderful to play with the Juventus jersey on my back. The Coach expects a lot from me and I'll try to give my all, as I always do.
"That's all I can do, as after that others will judge my performance."