Ronaldinho twisted his right ankle in his team's 2-0 Primera Liga defeat to Getafe and this week, he has been doing physiotherapy exercises.

But national team doctor Jose Luiz Runco is optimistic Ronaldinho will recover to play in Sunday's third round clash in the qualifying game for South Africa 2010.

"Ronaldinho woke up quite better today, but he cannot train with the ball yet. Expectation is still positive," said Runco.

"We'll test him every day to analyse his improvement. Today, he has a 70% chance of playing."

Brazil were held to a goalless draw by Colombia and hammered Ecuador 5-0 in the two opening games. But coach Dunga believes Sunday's game will be made all the more difficult as Peru have yet to win a game.

"All the national teams prepare themselves more when they play us. Peru have not won yet so we'll have to battle against that," he said.

And Dunga is not concerned at this stage of the qualifiers about being two points below Argentina, the only team to have won its opening two matches.

"To win and be leaders is good, but it's not the most important thing. If we don't win a qualifying game, it won't mean we'll miss the World Cup."