The 25-year-old made the move to the French side after they activated his €222 million (R3.31 billion) buyout clause in August 2017, making him the most expensive player in the world.
"He's now at PSG but from a sporting perspective his decision was a backward step", the 2002 World Cup victor said in an interview with former Brazil captain Zico published on YouTube.
"But there are challenges that everyone seeks".
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'I played in Barcelona at the time and went to Inter when the Italian championship was much more competitive'.
PSG were 2-0 winners on the night with Adrien Rabiot adding to Neymar's goal towards the end of the game.
And he'll be hoping to get on the scoresheet again when they take on Claudio Ranieri's Nantes this weekend.
His fellow global compatriot grabbed all the transfer headlines in the summer when he swapped giants Barcelona for the Ligue 1 side in a world record £198million deal.