Oil prices have fallen sharply on hopes of a deal that could bring an end to the US-Israel war with Iran.
US Secretary of State Marco Rubio said negotiators had a "pretty solid thing on the table" and an agreement to end the conflict might be reached on Monday.
On Monday morning, global oil benchmark Brent fell 5.5% to $97.90 a barrel, and remained around $97.70 a barrel in the afternoon.
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Iran says some progress has been reached in talks with the US, but a deal "is not imminent".
Foreign ministry spokesman Esmail Baqai's remarks came after US Secretary of State Marco Rubio said an agreement could possibly be reached on Monday.
"It is correct to say that we have reached a conclusion on a large portion of the issues under discussion," Baqai said in Tehran on Monday. "But to say that this means the signing of an agreement is imminent - no-one can make such a claim."