"The majority of countries on the (IAEA's) board of governors are inclined to solving this issue peacefully," Salehi said.
"From now until Monday there will be a lot of developments. It is not predictable, but what we can definitely say is that things are moving in favour of Iran," he added.
Salehi's comments came after the United States claimed Iran had made "brazen and systematic" breaches of nuclear safeguards, but nevertheless appeared to back away from demands for the Islamic republic to be referred to the UN Security Council.
The IAEA meeting was adjourned until Wednesday after the United States and Europe's big three -- Britain, France and Germany -- failed in two days of intense, closed-door negotiations to agree on a resolution in response to the watchdog's report detailing almost two decades of hidden Iranian nuclear activities.