European Union foreign policy chief Javier Solana will hold new talks on Thursday with Iran's top nuclear negotiator Ali Larijani, Solana's spokeswoman said.
"We can confirm the meeting for Thursday, and we will confirm the venue soon," spokeswoman Cristina Gallach said in Brussels on Wednesday.
European diplomatic sources said the meeting would probably be held in Paris.
Solana is negotiating with the Iranians in the name of six major powers - the five permanent UN Security Council members and Germany - to encourage Tehran to accept political and economic incentives to suspend uranium enrichment.
The six powers, notably the United States, fear that Iran is planning to develop nuclear weapons, a charge which Tehran rejects saying it has only a civil nuclear power programme.
The United States is pushing for United Nations sanctions against Iran for failing to honour an August 31 UN deadline for it to halt the strategic nuclear fuel work but Russia and China want to give more time for talks to get Iran to comply.
Solana and Larijani held talks dubbed "constructive" over the weekend in Vienna, and agreed to meet again this week.
Larijani said then that Iran could consider a temporary halt in uranium enrichment.
World powers were struggling on Tuesday to agree on joint statements on Iran at a UN nuclear agency meeting in Vienna, with diplomats saying this showed divisions in how to crack down on Tehran.