Klopp told DAZN: "It's pretty simple". Leo Messi, €300 million.
However, even though PSG may have to sell players to comply with Financial Fair Play regulations following Neymar's transfer, the Parisian club may not be willing to sell Di Maria to Barcelona after the Brazilian forward's transfer saga has strained relations between the two clubs.
Spanish publication Sport claim that Di Maria is just one of a number of potential targets for the Catalan club as they desperately try to replace Neymar, who is now one of Di Maria's team mates at Paris Saint-Germain. A simple solution would be a rule.
The president said; "The way he acted was certainly not the best and not the kind of behaviour that we want from a player of Barcelona".
"The biggest clubs can decide on that, where they would want to set a limit".
Barca, who have five-time Ballon d'Or victor Messi on their books, and LaLiga have threatened to report PSG under the Financial Fair Play rules. €150 million or €550 million, or whatever, and then no one would complain anymore.
Klpp suggests that football is more than just signing players. A star player on one side and another one on the other makes the player in the middle a star too. Suffice to add that Neymar's contracts are brokered by his father - and that both Neymars are reportedly under investigation by tax authorities, as was Barcelona after the transfer from Santos. "They made the offer and they finalised it".