That leader will be, in effect, under Baghdadi, a super deputy to the caliph -- in Arabic, na'ib al-malik, or viceroy, the report said.
The report revealed that Baghdadi suffered serious injuries in March during an attack by by the US-led coalition.
The Iraqi interior ministry said Wednesday that a woman recently detained in Lebanon is not the wife of the Islamic State (IS) group leader, Abu Bakr al-Baghdadi, but a sister of a convicted terrorist.
The officials declined to give the name or nationality of the woman whom they described as one of his wives.
Abu Bakr al-Baghdadi also said a US-led military campaign against his group in Syria and Iraq was failing.
Al-Baghdadi, believed to be in his early 40s, has a $10 million US bounty on his head.
Iraq's Defense and Interior Ministries issued statements saying al-Baghdadi had been wounded, without elaborating.
The UN's most powerful body, in a resolution adopted unanimously on Friday, also demanded that the Islamic State extremist group and all al-Qaeda-linked groups end violence and disarm and disband immediately.
The US has offered a USD 10 million reward for information leading to the conviction and arrest of Abu Bakr al-Baghdadi.
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