The Swedish attacker will depart when his current contract expires at the end of June.
Therefore Head Coach Pep Clotet will continue to prepare the current squad for the remaining fixtures in training without the 26-year-old.
Mrabti joined Blues in January 2019 from Djurgardens IF.
A versatile player, he has performed across the frontline for Blues as well as out wide.
Mrabti has made 17 appearances this season and scored twice.
Kerim leaves Blues with our very best wishes and good luck for the future. A popular figure, he has served the Club well.