Washington and Tehran both have said they were sending teams to the Gulf state, but issued conflicting statements on most other details, including timing and purpose of the trip.
The nations' preliminary agreement to stop the conflict and reopen the vital Strait of Hormuz has repeatedly come under strain due to clashes, but has also been dogged by the sides' contradictory assertions.
Just after Trump's Truth post on Monday asserting the Doha meeting with Iran, his spokeswoman told Fox News that US envoy Steve Witkoff and Trump's adviser and son-in-law Jared Kushner "will be flying to Doha for high-level meetings this week".
CNN reported early Tuesday that Witkoff was en route to Qatar.
However, Iranian foreign ministry spokesman Esmaeil Baqaei said Monday that a delegation of the country's own experts would travel to Doha this week, but staunchly denied any sit-down with the Americans.
"We have not yet entered the stage of negotiating a final agreement," he said, noting that "over the coming days, we will not have any negotiation meetings with the US side at any level".
"To the best of my knowledge, there are no direct meetings scheduled between the two parties in the coming days," foreign ministry spokesman Majed Al Ansari told reporters in Doha, adding that the American team would meet with mediators. "To my knowledge there is no high-level meeting between the two sides."
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