Both sides start the match on three points in Group A after winning their respective opening fixtures of the tournament.
While the Selecao will be expected to win the game, Oscar believes that the Mexicans will provide stiff opposition in Fortaleza.
"We know that Mexico are a good team, they always give Brazil a hard time and it won't be any different when we play in the next match," he is quoted as saying by Eurosport. "Mexico are good coming forward and they are very fast on the counter-attack.
"The training we are going to do this week ahead of the Mexico game will be different from the training we did before facing Croatia. Mexico play totally differently from Croatia."
Oscar is expected to start against Mexico after receiving widespread praise for his performance during Brazil's 3-1 victory over Croatia.