The 33-year-old also joked that the French club need to sign him to fill the missing piece.
"Paris is in my heart because it's the first team I played for in Europe," he told French TV station TF1.
"Now PSG are one of the strongest teams in the world. There are a lot of great players and many of my Brazilian friends playing there.
"It's fantastic to see PSG like that. It's starting to become like a dream team. There's only me missing!"
Ronaldinho played for PSG for two years from 2001 until 2003.