Coutinho returned to Barcelona last week after completing a season-long with German giants Bayern Munich, where he won the Bundesliga, German Cup and UEFA Champions League, but has been linked with a permanent move away from the club.
"[Ronald] Koeman called him right after the Champions League victory with Bayern, the following day, and told him he's very much in his plans and would like him to return," Joorabchian told talkSPORT.
"He was due to return on September 7 but actually he returned at the beginning of September because he didn't want to lose his momentum and fitness, and he's been training with Barcelona.
"All signs point to the fact Barcelona have changed quite dramatically, the way their philosophy of how they wanted to move forward from last year and the players they've brought in, like Coutinho, [Ousmane] Dembele and [Antoine] Griezmann.
"They're all going to be part of the squad this year."