The former Elfsborg player has received an Iraqi passport in "record time" after the final work was carried out at the Iraqi consulate in Michigan, the association said.
He thus follows in the footsteps of Amir Al-Ammari, Hussein Ali and Kevin Yakob, who have also left the Swedish national team to represent the Iraqi national team.
Qasem left Allsvenskan in 2024 to play in MLS for Nashville.
Iraq will face Norway, France and Senegal in the World Cup. The Iraqi squad has not yet been announced.
