The Argentina international joined Palermo from Huracan in 2009, with Sabatini the instigator of the deal in his previous job with the Sicilian side.
Pastore subsequently joined PSG for a reported €40 million three years ago but he is no longer a first-team regular at the Parc des Princes.
As a result, the playmaker has regularly been linked with a return to Serie A, with Sabatini's presence at the Stadio Olimpico seen as particularly significant. The 25-year-old, however, expects to remain in the French capital.
"I still have one year left on my contract with PSG," he told Corriere dello Sport. "But I often speak with Walter Sabatini. It was he who brought me to Italy. I have great respect for him."
However, Pastore still feels that a move to the Stadio Olimpico is unlikely to happen this summer.
"I remain calm for the moment," he told reporters after Argentina's friendly with Ecuador on Tuesday. "I have to finish the season in France and then I'll see.
"But I am sure that I am going to stay with PSG."
Pastore, who netted in his country's 2-1 friendly success, has racked up six assists and three goals in his 26 Ligue 1 appearances so far this term.