The Barcelona star scored the opener through a beautiful free kick that makes Luiz Felipe Scolari's side ahead in the 27th minute, after a fairly slow start to the game.
"I'm still not ready. Less I am still fit and I was a little tired at the end of the game - but we will live tournament later in great physical condition," said the 22-year-old reporter.
"I want to see more patient fans. We are still not familiar with the existing field, but when the team started to play faster and we got used to it, we will perform better," he concluded.
Brazil will face Croatia in the opening match of the 2014 World Cup tournament.