Barcelona has huge problems due to large financial debts, poor organization of the club, disturbed relations between players and management, incompetent management etc.
Messi's departure was logical and expected due to all these problems.
Barcelona needs a good striker? Maybe Suarez?
In fact, Barcelona now urgently needs a lot of money to save itself from financial ruin and going into football mediocrity.
They can forget about some great football successes and trophies in the next few years.
It's obvious that Barcelona is not the favorite in the Champions League this year and they are still not sure that they will pass the group stage of this competition.
^ Barcelona is facing some real problems right now because they are in a really bad cycle. If they sell some players in the upcoming transfer window, they might not be able to stay in the top 4, so they won't be able to play champions league, so they will get less money. They can't buy anyone too. They can't even sack their manager because if they sack him, as per rules they have to pay the whole contract length. They can't afford that right now. So I think they just need to survive for 2-3 seasons then get some financial stability. Then Maybe they can buy some players.
These are going to be very important weeks for Barcelona and especially for Koeman. I don't really like him as a manager and I think if he loses the Clasico now and then maybe has another fail in the next game in the Champions League, there are even tougher times ahead than is already the case. How would the club stick to Koeman without their fans freaking out? That's impossible.