The match at National Stadium in Kallang would be the second-ever clash between the two sides at senior level after Brazil beat Nigeria 3-0 in Lagos 16 years ago.
Following Brazil assistant coach Cleber Xavier's comments earlier in the week singling out Everton forward Iwobi as the biggest threat to the five-time world champions, Ndidi has warned the Selecao against focusing on one man.
“Brazil don't have to worry about Alex only, they have to worry about our whole team,” Ndidi told The Strait Times.
Ndidi expects a tough match on Sunday and feels Brazil will offer the perfect challenge for the young Super Eagles side to gain international football experience.
“Brazil are a good team and it is not going to be easy," Ndidi said.
"But this is why we are here, we want to see where we are at. The game will serve as a test for our young team trying to get experience for these types of games in tournaments.”
Brazil go into the match fresh from a 1-1 draw with another African football giant, Senegal in Thursday’s international friendly match in Singapore.