The 31-year-old, who was the league's joint top-scorer last season with 21 goals and helped PSG finish second, has been at odds with coach Carlo Ancelotti for weeks and has not played competitively for more than a month.
"I found an agreement with al-Gharafa," Nene told French channel TF1.
"It has been difficult because I was still dreaming to play for Brazil and meet up with my family," added Nene, who was close to signing for Brazilian side Santos last week.
"Things like that only happen once in a lifetime. I don't know if people will understand... I just thought about my future and secured it for my family," he said.
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