Iran's top nuclear negotiator Saeed Jalili could hold talks with EU foreign affairs chief Catherine Ashton in Turkey, the Iranian foreign ministry spokesman said on Tuesday.
"Ms Ashton had requested a meeting several times. Iran agreed to this but the date has not been set yet. About the venue, as Turkey suggested that it be held there, we do not see a problem with that," Ramin Mehmanparast said.
He told reporters that Jalili, who is secretary of Iran's Supreme National Security Council, would represent Tehran in the talks.
Ashton said in Brussels on Monday that she was prepared to hold talk with Iranian leaders, but only about its nuclear programme.
"We should wait and see what issues she wants to discuss," Mehmanparast said, insisting that Iran's nuclear programme was a matter for discussion with the International Atomic Energy Agency.
"If she wants to bring up international issues, we will examine them and the nuclear fuel swap has its own formula," the spokesman said.
Ashton asked Ankara to contact Iranian authorities and try to organise talks on behalf of the six world powers, a spokesman in Brussels said. Iran is already under three sets of UN sanctions.
Mehmanparast said on Tuesday that Iran had been discussing "a new formula" for the nuclear fuel swap with Turkey and Brazil -- both non-permanent members of the UN Security Council.
"The new formula does not cover the venue of fuel exchange. We have always said the swap should take place inside Iran."
The two countries are opposed to fresh sanctions against Iran and have stepped up efforts for a diplomatic solution to the nuclear standoff.
Turkish Prime Minister Recep Tayyip "Erdogan will be in Iran at the same time as the Brazilian President" Luiz Inacio Lula da Silva, who is due to make an official visit to Tehran from May 16 to 17, the spokesman said.
"Talks will be held with both leaders on the nuclear fuel deal, he said.