A senior US official later told Reuters that President Donald Trump is "very likely" to approve the recertification.
Iranian Foreign Ministry Spokesman Bahram Qasemi had said before that no meeting is planned between Zarif and Tillerson, unlike the last couple of years when Zarif was in regular contact with the former top USA diplomat, John Kerry, on the 2015 nuclear deal.
The Trump administration is reportedly planning to recertify Iran's compliance with the historic deal to curb its nuclear program.
But the decision about whether to scrap the deal has reportedly sparked fierce internal divisions, with Secretary of State Rex Tillerson arguing the US should keep the seven-nation accord. But that official also said the president has "reservations" and could decide not to. "This is one of the worst deals ever made by any country in history", Trump said in September at a presidential debate.
The official, who spoke on condition of anonymity, said Trump could always change his mind. That report, due 180 days after Trump's inauguration, was part of restrictions lawmakers put on the agreement, as was the 90-day certification requirement.
The final press conference of Iran nuclear talks in Vienna, Austria on July 14, 2015.
Iranian Foreign Minister Mohammad Javad Zarif has called on the United States to reconsider its approach towards the Joint Comprehensive Plan of Action (JCPOA aka nuclear deal). The historic agreement shut down most of Iran's nuclear program, in some cases for decades, in exchange for an easing of global sanctions.
The White House said Monday that Trump, in interactions with members of a Group of 20 summit held in Germany earlier this month, had called on them to "stop doing business with nations that sponsor terrorism, especially Iran".