Laurent Blanc's side cruised to a 2-0 victory over Olympique de Marseille on Sunday, capitalizing on second-place Monaco's defeat to Saint-Etienne to take a commanding eight-point lead in the French top tier.
PSG is now the heavy favorite to retain the title it won last season, and the star striker doubts any team can catch the club before the end of 2013-14.
"We have our destiny in our own hands," Ibrahimovic told Ligue 1's official website. "It all depends on us. We need to keep on getting the job done. If we start to relax and not give 100 percent, we could end up punishing ourselves. But I don't think that another team can stop us. There is only us."