The Argentina international has two years left to run on his current deal after joining the French champions from Palermo in 2011.
Despite being linked with Juventus and Real Madrid over the summer, Pastore insists that he is happy with PSG.
"My contract? I have had no talks with the club to prolong it," the 25-year-old is quoted as saying by L'Equipe. "Last year, officials spoke about such a possibility, but to me, my commitment to the club doesn't depend on contract matter.
"I still have two years remaining on my contract. I trust the chairman and he has my word. I don't need to sign any paper sheet to stay here, and he knows it is not my style to leave the club as free agent."
Pastore has made six appearances in all competitions for PSG this season.