Coach Lars Lagerback admits Nigeria are in a "very tough group" but is confident they can make an impact at the World Cup.

The Super Eagles face Argentina, South Korea and Greece in Group B but the Swede is optimistic over his side's chances.

"We have a very tough group, the quality of the opposition is very good and what I know is that all the teams want to win," he said. "But the Super Eagles are ready to take on the world's best. We know there are high expectations, especially from our fans. If we give our 100%, we can beat any team."