The mission is led by Mohammed N’fah Alie Conteh, Chairperson of the Electoral Commission of Sierra Leone and will stay in Nigeria between 1st and 15 November.
Mission will also visit some key cities around Nigeria outside of the capital city Abuja.
Nigeria which is the biggest economy in West Africa goes to the polls on February 16, 2019.
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Political watchers say the polls is a straight contest between incumbent Muhammadu Buhari of the APC party and Alhaji Atiku Abubakar, the candidate of the Peoples Democratic Party (PDP).