The Bosnian midfielder was expected to play a big role at Camp Nou.
Miralem Pjanic joined the Catalan giants from Juventus last summer in a deal that saw Arthur go the opposite way.
The 30-year old midfielder has featured only five times in the La Liga this season but insisted that he will continue to fight for his place.
The Bosnian has found himself mostly on the bench under manager Ronald Koeman though he started six of all Champions League matches and is yet to register a goal or an assist for his new club.
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“I have played at all the clubs I’ve been at and with all the coaches I’ve had. A situation like this has never happened to me. Of course it’s not easy, I accept it with great difficulty,” Pjanic told in an interview with Telefoot.
“I don’t have the exact reasons why I’ve not had the playing time I expected.
“I keep working and you have to respect the decisions that are taken, even if you don’t agree. I want to leave my mark at this club.”