Interim Super Eagles coach Austin Eguavoen said he had told the players that they had yet to win anything in Cameroon.
He also promised that Nigeria will not look down on Guinea-Bissau when they meet in the final Group D match on Wednesday.
Nigeria has brushed aside Egypt and Sudan in their last two matches to accumulate 6 points while Guinea-Bissau needs a win to stand a chance of progressing to the last sixteen.
Eguavoen, however, vowed that his boys would keep fighting, adding that no one can conclude that Guinea-Bissau is a boost.
The winner of the 1994 African Cup of Nations said it was important for the team to keep winning matches despite reaching the round of 16.
“Just as I told the boys after the match against Egypt, we are yet to win anything here except points.
“Guinea Bissau need the three points because they have only one so far and we must be prepared for a massive fight.
“With a little more luck, they could have beaten Sudan and could have drawn with Egypt. That is the kind of opposition we face on Wednesday. Nobody will tell me they’re pushovers.”