This is Amano's first visit after the beginning of the implementation of the landmark nuclear agreement between Iran and six world powers, IRNA reports.

Amano is scheduled to meet Iranian President Hassan Rouhani and Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi.

Behrouz Kamalvandi, the spokesman for the AEOI, said on Sunday that Amano’s visit comes at the invitation of Iran, adding that the IAEA chief is expected to discuss with Iranian officials ways to speed up the implementation of the JCPOA.

“In the JCPOA, the implementation process is estimated to be eight years but we want to achieve it earlier and this is possible with cooperation between Iran and the IAEA,” Kamalvanid added.

Kamalvandi stressed that Amano will not visit any nuclear site in Iran.

On Saturday, Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Federica Mogherini read out a joint statement in the Austrian capital, Vienna, announcing that the JCPOA had come into force.

According to the statement, all nuclear-related sanctions imposed on Iran by the European Union, the UN Security Council and the US are lifted.

On the same day, the IAEA confirmed that Iran has remained committed to the nuclear agreement with the world powers.

Amano announced that Iran had taken the necessary preparatory steps to start the implementation of the JCPOA.

The announcement was made after 'inspectors on the ground verified that Iran has carried out all measures required under the (July deal)... to enable Implementation Day to occur,' he said in a statement.

Iran and the five permanent members of the UN Security Council – the United States, Britain, France, Russia and China – plus Germany finalized the JCPOA in Vienna, on July 14, 2015.