Neymar Sr claims he was keen for the 25-year-old to stick with the Catalan giants but the “attitude of their board” changed his mind.
The Brazilian moved to PSG for a world record £199million last week, but the transfer was held up by a €26million loyalty bonus, which Barcelona would only pay if Neymar stayed in Catalonia.
Under the terms of Neymar’s contract signed last summer, the 25-year-old and his representatives were due to be paid the sum on July 31 if he was still at the club.
Neymar’s deal was not formerly completed until August 3, meaning, technically, Barcelona owed him the money.
Discussing the transfer in detail, Neymar Sr told Cadena COPE: “There’s a clause, which is determined by both the player and the club.
“Do you understand? The player has to fulfil his contract, and if not, he has a clause to pay. It’s very simple, it’s very easy, it’s very clear, his contract even more so, thank god.
“€26million bonus? If they weren’t going to pay us, I couldn’t do anything about it. I couldn’t blackmail them.
“At that moment, Barcelona lost my support. Until that moment, they had it. His contract was very explicit and very clear.
“It was a bonus for him signing his contract, so the player’s clause has increased. If Neymar had to leave, it would be a reason for it to be increased, but that’s a topic to discuss in the future, not for now.”
The Brazilian trained with his new teammates on Friday, and was filmed linking up with fellow countrymen Dani Alves, Thiago Silva and Lucas Moura.
Neymar is due to make his debut for the Ligue 1 giants, who got off to a winning start at home to Amiens on Saturday, against Guingamp next week.