Brazil midfielder Oscar has admitted that the host nation must improve if they are to win the World Cup on home soil.

The Chelsea playmaker's late strike added to a Neymar brace as the hosts recovered from falling a goal behind to triumph 3-1 against Croatia in their opening Group A game on Thursday.

"The first game is always difficult, especially after conceding an early goal," Oscar told reporters on Saturday. "But it was very good. Although we conceded the early goal, we played well and found a response.

"The next game will be hard again. Every game for us is final. We have to fix things and we have to think about the next game."

Brazil are back in action on Tuesday against Mexico before facing Cameroon in the final group game on June 23, six days later.