Disclosure of the confidential agreement to the US Senate will have repercussions, Reza Najafi, Iranian ambassador to IAEA, was quoted as saying by Press TV on Saturday.
"Definitely, the agreements between a country and the UN agency, which are classified, can by no means be availed to any other country," Najafi said.
Iran and the IAEA recently signed a roadmap in the Austrian capital of Vienna for the clarification of past and present issues regarding Iran's nuclear program by mid-December.
The confidential texts between Iran and the IAEA have not even been provided to the US government and cannot be given to the Senate either, Najafi was quoted as saying.
Amano has said that the roadmap sets out a clear sequence of activities over the coming months, including the provision by Iran of explanations regarding outstanding issues.
"The roadmap enables the IAEA to issue a report setting out the agency's final assessment of possible military dimensions to Iran's nuclear program, for the action of the IAEA Board of Governors, by 15 December 2015," he added.
Iran and the P5+1 group -- the United States, Britain, France, China and Russia plus Germany -- reached an agreement on July 14 to settle Iran's sensitive nuclear program.
Under the Joint Comprehensive Plan of Action (JCPOA), significant limits are exerted on Irans nuclear activities in exchange for the removal nuclear-related international and western sanctions. The implementation of the deal heavily relies on IAEA's December report on Iran.