'"I am not yet at 100 per cent fitness," said the Swede, who has scored an impressive nine goals in six matches so far for PSG.
"I've scored goals and I've played well but I've had two matches when I wasn't good and my teammates know it," Zlatan added.
"Each day that you play and every match that you play, you get stronger in experience. I feel I am getting better with each year that passes and I'm playing in a manner that I want to play".
"The day I stop progressing is the day that I stop playing football.
During Wednesday's press conference, however, Zlatan hit hard against the Swedish media:
"You wait for when it doesn't go well. That's how the media works, you build us up and then you want to tear us down," Zlatan said.
According to the footballer, 95 percent of what is written about him are lies.
"Like I have said before: 95 percent is fiction, maybe 2.5 percent has some factual accuracy and 2.5 percent is true."
"I just wish I made some cash from it," Zlatan said to the gathered press.
Sweden are coming off a 2-0 victory over Kazakhstan in their only match so far as they attemp to take maximum points against Group C minnows the Faroe Islands.