"There is no decision [in this regard] at this point, but different scenarios could be considered,” Sanaei said in an interview with Rossiya-24 television.
The diplomat added that such scenarios could be considered if Iran sees that other countries participating in the JCPOA "do not fulfill their commitments."
Earlier this month, Washington introduced the second package of sanctions targeting Iran's oil sector.
The measures were introduced in line with the US President Donald Trump's decision to withdraw from the 2015 Joint Comprehensive Plan of Action (JCPOA), known as the nuclear deal, and re-impose its sanctions against Iran that had been lifted under the agreement. The first round of the US restrictions came into force in August.
Other parties to the deal — China, France, Germany, Iran, Russia, the United Kingdom and the European Union — have, however, expressed their commitment to the accord and are working on instruments to bypass the US restrictions. In particular, European diplomats have proposed to set up the so-called Special Purpose Vehicle (SPV) facilitating trade between European companies and Iran.