Nigeria's U23 team need to "work harder" if they are to make progress at the Olympic qualifying tournament, according to striker Danny Uchechi.
The "Dream Team" lost first game of the tournament in Morocco, going down 1-0 to the hosts on Saturday.
They play Senegal on Tuesday in their second game and could go out if other results go against them.
"We need to have time together as a team, train together and get to know each other well," Uchechi said.
"We should have done better [against Morocco] - hopefully on the training ground we will try to correct our mistakes."
Nigeria have a proud record in Olympic competition, having won the tournament in 1996 and taken silver in Beijing four years ago.
Senegal also lost their opening game of the tournament, with a 1-0 defeat at the hands of Algeria, but Uchechi says he and his team mates cannot dwell on what their opponents will do.
"We are going to try and play our own game and see if we can come out on top," he said.
But Senegal are determined to give a good account of themselves in what they see as a must-win game.
"If we want to qualify we have to win [against Nigeria] - we know it's not going to be easy, it's going to be a tough game, but we have a good team," defender Kara Mbodj told the BBC.
The other match on Tuesday is the reverse fixture within Group A, as the two winnings side - hosts Morocco and Algeria - meet each other in Tangiers.
A draw in that game, coupled with defeat for Nigeria, would see the Dream Team out of the competition.