I believe the Catalan club will find a way past this before the transfer window comes to an end in the last day of August.
With french international Griezmann looking quite certain to leave, this should help the club go below the expectation set by the Spanish Football Authorities.
If he doesn't, Barcelona would have to find a way of cutting down their top players salaries or Lionel Messi saving the team by accepting a pay cut. Which I believe he can due to the love he has for the club.