The 30-year-old signed a four-year contract with the current La Liga champion, after a successful stay in the Italian Serie A.
He helped Juventus win three league titles at the club in four years and it looks like he will add another point this season with a team that has four points at the top of the table.
Veteran duo contracts
The move by the Bosnian international will see that Barcelona’s Arthur will move in the other direction, with Juventus paying the Brazilian an initial $ 80 million.
Arthur joined Barcelona from Brazilian club Grêmio in 2018, winning a league title and a Super Cup in his debut season.
Like Pjanic, the 23-year-old will not move to his new club until the end of the current season.
Juventus have also agreed to extend a one-year contract for both 35-year-old captain Giorgio Chiellini and 42-year-old goalkeeper Gianluigi Buffon.
The veteran keeper has played for Juventus more than 500 times since his debut in 2001, and returned to Italian equipment last year after a showdown with French champions PSG.