UN nuclear watchdog chief Rafael Grossi said on Wednesday he might head to Iran in the coming days to discuss its disputed atomic program and that he expected to work cooperatively with US President-elect Donald Trump.

Grossi had previously said he hoped to go to Tehran ahead of the Nov. 5 U.S. vote as he seeks to resolve several long-standing issues that have dogged relations between Iran, the International Atomic Energy Agency and Western powers.

"We are already talking to colleagues in Iran for my next visit maybe in a few days. We still have to confirm the time but this will be done," he told a news conference in Rome after a nuclear energy event.

Without confirming it, Iranian officials have welcomed a visit from Grossi, saying Tehran is ready to cooperate with the IAEA to resolve outstanding issues, without giving details.

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Issues at stake include Tehran's barring of uranium-enrichment experts from IAEA inspection teams in the country and its failure for years to explain uranium traces found at undeclared sites.