The deal is more or less done, he said, noting that there are just "a few details" that still need to be resolved.

The lifting of key sanctions in areas such as oil exports, Iran's central bank and the shipping industry has already been agreed, according to Rouhani.

Iranian Deputy Foreign Minister Abbas Araghchi said the structure of the agreement had been achieved.

"The content is almost clear although not yet finalised," he said.

He noted there were still some differences on some key issues where no agreement had yet been reached.

"We hope next week the delegations will come with clear decisions to make the agreement final," Araghchi said.

All five partner countries in Iran's 2015 nuclear deal are in agreement, he said on Iranian state television on Thursday.

Britain, China, France, Germany and Russia have been negotiating with Iran and the United States in Vienna for the past six weeks in the hope of restoring the 2015 accord aimed at preventing Tehran from developing nuclear weapons.

The deal has been hanging by a thread since 2018, when then-US president Donald Trump pulled his country out and Tehran began to increasingly violate its terms.

The talks have centred on which sanctions Washington would be prepared to lift and what steps Tehran would be willing to take in return to curb its nuclear program.

Negotiations are set to resume next week.

Tehran has repeatedly said it will return to its obligations under the Vienna accord as soon as Washington lifts its sanctions. This includes extending its cooperation with the International Atomic Energy Agency and allowing UN inspectors to return to the country's nuclear sites.

with DPA

Australian Associated Press