Nigeria’s coach Gernot Rohr believes his team will not peak for another four years despite his side’s 2-0 win against Group D rivals Iceland.
Leicester striker Ahmed Musa’s second-half double in Volgograd kick-started Nigeria’s World Cup after defeat to Croatia in their opening match.
The Super Eagles’ win means they, Argentina, who they face in their final match, and Iceland still have a chance of qualifying for the knockout stage.
"What I like in my young team is humility, solidarity and fighting spirit," Rohr told a press conference. "I thought before this World Cup we were here to learn.
"I think this team will be ready in 2022 and this World Cup is coming early, but we have a good chance to win against Argentina."
A win would take Nigeria through to the knockout rounds while a draw will be enough providing Iceland do not beat group leaders Croatia by a big enough margin.
"I think scoring against Argentina isn’t that difficult for me," Musa said. "We know the importance of the game. It’s do or die, we have to win.