The head of the International Atomic Energy Agency will hold talks with the new head of Iran's atomic energy organization on Sunday.
The IAEA announced on Saturday that Rafael Grossi was scheduled to arrive in Iran on that day and meet Mohammad Eslami on the following day.
It is Grossi's first visit to Iran since the new government led by president Ebrahim Raisi was formed in August.
Grossi and Eslami's meeting comes before the IAEA's regular meeting of governors, which will begin on Monday.
The two are expected to discuss the report issued by the IAEA on Tuesday on Iran's nuclear program.
The report says that Iran is continuing to enrich uranium to up to 60 percent purity, a level far beyond limits set under the 2015 nuclear deal.
It says that Iran had an estimated 10 kilograms of uranium enriched to that level.
The report also says that as Iran does not cooperate, the agency's surveillance activities are severely hampered.
The United States and Iran began indirect talks in April to salvage the 2015 agreement, but those talks have stalled.