Tevez joined the Serie A champions from Manchester City earlier this summer, and the experienced goalkeeper feels the 29-year-old's decision to move to Turin proves that the Bianconeri have truly returned to the continental elite.
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"Evidently, his decision to come here means that we’ve also done something important on a European level."
Tevez was joined by fellow forward Fernando Llorente and defender Angelo Ogbonna in moving to Juventus Stadium this summer, and Buffon is delighted with the strength in the depth at coach Antonio Conte's disposal.
"The new arrivals have already blended in well with the group and don’t hold back when there’s work to be done. They’ve got an excellent attitude," he continued.
"I’ve come back to a stronger Juventus side. Now we’ve got additional elements of excellent quality. We’ve taken a genuine step forward."
Juventus are currently preparing for the the Supercoppa Italiana clash against Lazio on August 11.