Arthur is part of Barcelona's squad to face Atletico Madrid on Tuesday despite the Brazil midfielder's €70million move to Juventus reportedly being close to completion.
Juve's Miralem Pjanic is set to move in the other direction, although both players will conclude the 2019-20 campaign at their current clubs.
Arthur was seen giving a speech to his team-mates at Barcelona's training session on Monday – an act that has been widely interpreted as the 23-year-old saying his goodbyes to a dressing room he joined in July 2018 from Gremio.
"I have no doubt about his greatest commitment until the last day he is here," Barca head coach Quique Setien told a pre-match news conference.
"He is a player until the last game of the season He has committed himself to being one more [member of the squad].
"He will dedicate himself fully to achieving the objectives. I have no doubts about him.
"He has said that he will be in the best conditions. I'll decide if he plays more or less."
Sergi Roberto is back in the Barca squad to face Atletico having sat out three matches with a fractured rib.
Two draws in their past three games have left the reigning champions two points behind Real Madrid at the top of LaLiga with six matches remaining, heightening speculation that Setien will be dismissed at the end of the season despite only being in post since January.