Nigeria will face Croatia this weekend before taking on Iceland and Argentina as they bid to make the knockout round of the competition.
"Croatia are a fantastic team with fantastic players, but we have good players too," Mikel told ESPN. "It's going to be a game of tactics. We have to play our game and make sure we control the game like we always do.
"It's going to be tough, but we know how we play and how we want to play, so we are going to have to continue playing that way."
Nigeria reached the last-16 stage of the 2014 World Cup before losing to France.