The 27-year-old, who signed from Palermo in 2011, has less than 12 months remaining on his current deal at Parc des Princes.
While the Italy international is more concerned with the start of the new season - with PSG beginning their title defence against Reims on Friday - he stresses that his future will be settled soon.
"My renewal? It's being discussed, everything is going well and I don't think there will be a problem but, at the moment, it's the last of my concerns," he told L'Equipe.
PSG confirmed on Thursday that they had pulled out of the race to sign Angel Di Maria from Real Madrid as they deemed the player to be "too expensive" given the constraints of Financial Fair Play.
While Sirigu says that the Parisians could still delve into the transfer market before the window shuts, he underlined his belief that the two new arrivals so far this summer - David Luiz and Serge Aurier - would strengthen an already-imposing squad.
"Last year, we already had a strong team and two players have arrived. I don't know if there will be a third," the keeper continued. "Aurier and David Luiz are great players who will certainly help us."