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If Neymar refuses a proposal from an Arab club then there will be no more coming of the same proposal, European clubs are also not much interest except for other leagues besides Europe, in essence Neymar will get big money during a two-year contract, PSG is benefited.
Neymar has already officially moved to Al-Hilal. I won’t be surprised if PSG’s Arab friends are behind this transfer - firstly, PSG got rid of a too expensive football player, and secondly, they not only got rid of him, but even received money for the transfer and thus improved their business in terms of FFP. As for Neymar, it is certainly hard to see the career of the once most promising player decline at the age of 31. I wouldn't be surprised if he completely finished at 33.
This condition is actually awaited by PSG from last season, it's just that no club dares to give the clause as desired, but with the Arab club with their madness in spending money this is a good thing for PSG.
Talking about Neymar's future career I think that even Neymar himself does not want to think more about this especially with the crazy salary conditions in Arabia during his contract then indeed in the end there is one more Brazilian player who disappeared from the radar after Hulk, Oscar, Pato and Willian who previously took a path almost similar to Neymar.
Well and indirectly this is the best solution that PSG got by selling Neymar to an Arab club, with the difficulty of getting interest from several other top European clubs for Neymar the arrival of an Arab club has become a big helper for PSG because as you said and as we know that only Arab clubs dare to offer this high for Neymar. Some European clubs were very thoughtful when they signed him for a sum that would have been fantastic but they could not get the appropriate contribution from the player because of his injury prone habits. But for the Arab clubs themselves it seems that they are not considering this, but for myself it seems that I will put a little doubt.
As for his future career, I don't think I'd expect much from him and perhaps his main priority now is a big salary, and this may be enough to justify his decision to accept Al Hilal's offer.