Barcelona midfielder Arthur Melo will join Juventus at the end of the current season, with Miralem Pjanic moving in the opposite direction, the two clubs announced on Monday.
Pjanic's four-year contract includes a release clause of €400 million while Juventus said Arthur's contract will run for five years, until June 2025.
In a statement, Juventus said they had signed Arthur for "72 million euros payable in four years. The purchase value may increase by a maximum of €10 million on the fulfillment of certain conditions during the contractual term."
Arthur's departure puts more scrutiny on Barcelona's board and president Josep Maria Bartomeu. They have overseen a number of haphazard moves in the transfer market and have been accused of failing to implement any clear sense of direction for the club.
Pjanic joined Juventus from Roma in 2016. He was brought up in Luxembourg and initially made his name in French football with Metz and then Lyon.
But he was persuaded to change his mind after being given limited game time under Quique Setien while Juve coach Maurizio Sarri had reportedly made it clear he would be a key figure in his side in Turin.
"He is still a Barcelona player until the end of the season and has promised that he will give everything to achieve the goals we have set. He is a guy who will be committed until the last day."