The Brazil international is set to join Serie A champions in a deal worth a reported £66-million after the 2019/20 Champions League campaign is completed while Miralem Pjanic will move in the opposite direction for £55m plus add-ons.
With the deal having been announced on June 29 with six LaLiga games remaining, Arthur has not featured a single minute for the Spanish giants and is not planning to return from Brazil after the squad received a one-week break.
It's been reported that the 23-year-old feels ostracised by head coach Quinque Setien and he's informed that club that he has no intention of returning despite the prospect of a hefty fine looming for his behaviour.
According to Spanish publication Sport, Arthur wants his contract cancelled in order to join up with his new teammates in Turin which could leave the Blaugrana in a precarious position.
Frenkie de Jong, Sergi Roberto and emerging talent Riqui Puig are the only available midfielders for Setien ahead of their last-16 clash against Napoli next month due to injuries and suspensions.