Despite recording a narrow win in the opening group match, Golden Eaglets defender Yahaya Lawali has admitted that it was difficult against Zambia.
Favour Daniel netted the only goal in the 77th minute to hand the former champion a total victory.
The energetic defender said they scored at the right time and also defended very well to emerge victorious in the game.
“It was a really tough game because Zambia is a good side.
“The little details gave us a win today. We scored when it mattered most and we defended well.
It has given us motivation for the next game”, he said.
Nigeria will face Morocco in the second group match on Wednesday.