The spokesperson further added that Iranian Foreign Minister Mohammad Javad Zarif will attend the Kuwait International Conference for the Reconstruction of Iraq.
About $22 billion USA will be required in the short term and another $66 billion United States in the medium term, the director general of the country's planning ministry, Qusay Adulfattah, told the conference, without indicating any time frame.
The seven provinces attacked by the militants suffered $46 billion in direct damage, including the destruction of 147,000 housing units, and the security forces took $14 billion in losses.
In December past year, Iraq declared the war with ISIS over and is now seeking foreign investments in major projects that would help it to revive its economy, which has also been hurt by low oil prices.
The projects include rebuilding destroyed facilities such as Mosul airport and new investments to diversify the economy away from oil sales, by developing transport, agriculture and industries based on the nation's energy wealth, including petrochemicals and oil refining.
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A member of Iraqi federal police sits next to destroyed buildings in the Old City of Mosul on July 23 after ISIS fighters were defeated in the region. It fought Iran for most of the 1980s and invaded Kuwait in 1990, leading to defeat by a USA -led coalition and more than a decade of sanctions.
Lise Grande, UN Humanitarian Coordinator for Iraq, warned failure to help Iraq could lead to renewed instability.
Although the US government was not expected to pledge direct financial aid at the conference, Tillerson said the official USA export credit agency, the Export-Import Bank of the United States (EXIM), would sign with Iraq's finance ministry on Tuesday a $3 billion memorandum of understanding "that will set a stage for future cooperation".
The foreign ministry spokesman noted that Iran will continue to support Iraq in post-ISIL era as it did during the fight against the terrorist group.
United States officials have already said there will be no new pledges of assistance for Iraq's reconstruction drive, after Washington pumped some $60 billion into rebuilding the country following the US-led invasion toppled Saddam Hussein in 2003. It must renew its embrace of the rule of law, as well as provide answers to families whose loved ones went missing in the war, said Katharina Ritz, the head of the delegation in Iraq for the International Committee of the Red Cross. The years of insurgency, sectarian violence and ethnic tensions that followed his overthrow in 2003 helped fuel the emergence of IS, a little more than a decade later.
Araji said that Iraq, which has been either at war or under global sanctions since 1980, is offering projects in nearly every field of the economy - from oil to agriculture.