Almeria striker, Sadiq Umar and Watford defender, Williams Troost-Ekong claimed the maximum three points for Super Eagles against Guinea Bissau in their last group D match.
Sadiq Umar scored in the 56th minute to put Nigeria ahead before Captain Ekong made it 2-0 in the 75th minute.
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Nigeria become the only side at the ongoing Africa Cup of Nations (AFCON) to win all three group games after beating Egypt, Sudan and Guinea-Bissau tonight making it 9 points.
Super Eagles will remain in Garoua, Cameroon for knockout stages.