"If the terrorist group (IS) come near our borders, we will attack deep into Iraqi territory and we will not allow it to approach our border," the official IRNA news agency quoted Pourdestana as saying.
The Sunni extremists of IS control a swathe of territory north of Baghdad, including in Diyala province, which borders Shiite Iran.
The United States launched air strikes on IS targets in Iraq in August and has since widened them to Syria, where the jihadist group has its headquarters, as part of an international coalition to crush the group.
It has provided support to both the Iraqi government and Iraqi Kurdish forces fighting the jihadists and has dispatched weapons and military advisers.
But Tehran, a close ally of the Damascus government, has criticised air strikes on Syria, saying they would not help restore stability in the region.
Iran's supreme leader Ayatollah Ali Khamenei has said he rejected a US offer to join the international coalition it has been building against the jihadists.
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