Foreign Minister Mohammad Javad Zarif was to hold a working lunch with European Union foreign policy chief Catherine Ashton, the lead negotiator for the six powers, his deputy Abbas Araqchi said.
The two diplomats will set the terms for the relaunch of negotiations for a comprehensive deal on the future scope of Iran's nuclear programme to allay international concerns about its ambitions, Araqchi told state news agency IRNA.
The honeymoon period after that call saw Tehran strike an interim deal with the six powers that gave it some relief from Western economic sanctions in return for scaling back its more sensitive nuclear activities.
But Iranian officials have sounded a more pessimistic note in recent days about the prospects for hammering out a comprehensive deal by a November 24 deadline.
"We hope that after the discussions that we have had with the Americans, the Russians and the Chinese, and the talks we will have on Wednesday and Thursday, we will able to make progress," he said.
Another deputy foreign minister, Majid Takht-Ravanchi, sounded a similar note of caution after talks in Geneva last Thursday with the other three powers involved in the negotiations -- Britain, France and Germany.
"After two rounds of negotiations with the European representatives, our positions have not been reconciled and disagreements over serious questions still exist," Takht-Ravanchi said on Saturday.
Tehran, which says its nuclear programme is exclusively for power generation and medical uses, in return wants painful European Union and US sanctions lifted.
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