The Arsenal striker is known for talking up himself in the media.
"My first sensations are that I am at the best club in the whole of Italy," the Danish striker told Juve's official website.
"The move has come at the right time in my career, I have already played against many teams from Serie A and they have always been very tactical.
"I will bring enthusiasm, lots of willingness and a big heart. I want to bring a lot on the field and not talk out of line as I have done in the past.
"I know exactly how Antonio Conte plays, as he was a fantastic player and now a great manager.
"I am very honoured to be here, and proud to wear the black and white jersey. I will give my all to score lots of goals."