PSG president Nasser Al-Khelaifi has revealed the staggering money offered to join the Super League breakaway.
Al-Khelaifi also spoke of what Real Madrid president Florentino Perez told him when the two men had lunch before the Champions League last-16 tie between the two sides.
"I could have taken the [Super League] cheque for 400 million euros," Al-Khelaifi told the BBC.
"They invited me. Then when I said no, they said they didn't invite me - that sums them up.
"The problem with ESL clubs is that they don't have stability. They don't have a long-term financial vision. They keep talking about their legal contract [with the Super League clubs].
"What they forget is football is a social contract, it's not a legal contract - they're waving around a piece of paper.
"Florentino Perez spoke to me at the Champions League game and said, 'We have to get a point where we can speak to you'. I was really tough with him.
"I said I was happy to talk, but if he was going to do stuff behind my back, I am not interested."