The Brazilian midfielder will finish the current LaLiga season at Camp Nou before joining the Italian champions in a deal worth an initial €72million (£66m), while Miralem Pjanic has moved the other way after passing a medical.
“The player will remain at FC Barcelona until the end of the official competition in the 2019/20 season.
“Arthur arrived at FC Barcelona in the summer of 2018 from Grêmio. The Brazilian midfielder has played 72 games for Barça until now: 47 in the league, 10 in the Copa del Rey, 13 in the Champions League and one in the Spanish Super Cup.
“The Brazilian midfielder, who has four goals from his two seasons at the club, scored his first goal against Osasuna in the league and has won two titles with Barça; the league and the Spanish Super Cup in the 2018/19 season.”
Arthur flew to Turin on Saturday night after appearing as a late substitute in Barcelona’s 2-2 draw at Celta Vigo.
The Brazilian returned on Sunday and is in Barca’s 23-man squad to face Atletico Madrid at Camp Nou on Tuesday night, with coach Quique Setien saying on Friday he hopes the 23-year-old can be important in the club’s remaining fixtures this season.
Barca and Juve announced the transfer of 30-year-old Bosnian midfielder Pjanic deal later on Monday for a total fee of around €70m.