The Brazilian's current deal runs until the end of the season, but he insists that he has no plans to part company with the Ligue 1 leaders.
"I am waiting for the end of the season to discuss it seriously with the directors," he told reporters. "I am working hard so that the club will take the best decision."
"I think if I can keep up my current form, there is still a chance I could be called up by the coach," he said. "While there remains a chance, I will continue to believe."
PSG take on second-placed Monaco in Ligue 1 this weekend.