Grace Mugabe, 52, told members of the ruling ZANU-PF party women's league that naming a successor 'will enable all members to rally behind one candidate'.
The world's oldest head of state, who has led Zimbabwe since 1980, has repeatedly refused to name a successor and says he will take part in next year's election.
His wife has previously said her husband could 'rule from the grave', adding: 'If God decides to take him then we would rather field him as a corpse'
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