There has been talk of a €100 million deal, but the former Netherlands international striker, who left his post at the Parc des Princes earlier in June, is pessimistic over the chances of a move taking place.
"I know that Verratti wants to sign with Barcelona but PSG won't allow it. It will be very difficult," he told La Sexta.
"Verratti will cost more than €100m.”
The 24-year-old is seen by those in Spain as a natural long-term replacement for Xavi, which is why strenuous efforts are likely to be made to sign him.
Nevertheless, PSG see the midfielder as one of the key players for their project’s future and are unlikely to let him go easily, having signed him from Pescara in 2012.