The Super Eagles were criticised after slumping to a 0-0 draw with Iran on Monday evening, but the former Arsenal and Portsmouth attacker believes that Nigeria have the quality to beat Bosnia-Herzegovina and Argentina in their remaining group games.
The 37-year-old is quoted by AllAfrica.com as saying: "We can beat any team. We can beat Bosnia and we can also beat Argentina, but to achieve this, we must work hard.
"It's too early to write off Nigeria's chances. It's just our first game and we now have to move forward. We have to learn from it, draw from the positives and move on."
Kanu, who twice won the African Player of the Year award, represented Nigeria on 87 occasions between 1994 and 2011.