The late Iranian president, Ebrahim Raisi, is to be laid to rest in his home city of Mashhad on Thursday.
The president, who died in a helicopter crash, alongside Amirabdollahian at the weekend, is to be buried at the city’s shrine of Imam Reza, the eighth imam of Shia Islam.
High-ranking representatives of friendly states are expected to attend, including Russian parliamentary leader Vyacheslav Volodin.
Iran’s state railway company has organised special trains to take mourners from Tehran to the north-eastern city.
There have been several ceremonies and public displays of mourning for Raisi, late foreign minister Hossein Amirabdollahian, and other victims of Sunday’s crash.
Millions of mourners flocked to a funeral procession in Tehran on Wednesday.
Raisi and Amirabdollahian died in the crash with seven other occupants of the ill-fated helicopter.
They went down in dense clouds in the mountains while travelling back from a meeting with Ilham Aliyev, the president of Azerbaijan.