"Until we agree on the framework, we cannot set a date," Saeed Khatibzadeh told reporters in connection with an annual diplomatic forum in Antalya, Turkey, on Saturday, according to AFP.
According to Khatibzadeh, both sides are now focusing on finalizing a memorandum of understanding before moving forward with further negotiations.
"We do not want to initiate any negotiations or meetings that are doomed to fail and that could serve as a pretext for a new escalation," Khatibzadeh said, calling the American stance "maximalist."
No uranium to the US
US President Donald Trump said on Friday that the US and Iran are "very close" to a peace deal and that representatives from both countries would meet over the weekend and on Monday.
At the same time, he claimed that Iran had also agreed to remove Iran's stockpile of enriched uranium from the country - something that has been denied by Iran and reiterated by Khatibzadeh:
"I can tell you that no enriched material will be sent to the United States," Khatibzadeh said in an interview with the AP.
"This is an impossibility, and I can assure you that while we are ready to address the concerns we have, we will not accept things that are impossible," Khatibzadeh said.
Stranded negotiations
Last weekend, delegations from the United States and Iran were in Pakistan for peace talks in the capital Islamabad. However, US Vice President JD Vance left the talks after less than a day without reaching any agreement.
On Saturday, Iran also announced it is closing the Strait of Hormuz again. The "strict control" Iran says it will impose in the strait is said to be in effect until the US allows ships to pass to and from Iran.
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