The former Manchester City striker will wear the number 10 shirt for the Serie A champions, which was previously worn by the club's leading goal scorer Alessandro del Piero.
The Argentinian told Cronica: "I have no problem with the sense of expectancy.
"I have demonstrated in the past the ability to withstand any pressure, even the weight of responsibility of wearing this shirt. In fact, I have to say that the responsibility excites me."
Juventus announced that the 29-year-old was joining the club last week.