They need that money now so they can buy their transfer targets for one thing. Also, Fer succeeding and getting regular games isn't just reliant on his injury record.
There's not going to be a court case. It's a minor offense that can be settled with the District Attorney. It will only go to court if Fer turns down the settlement offer.
This is a **** up really. Fer had surgery on his meniscus back in september, it was a recent injury. You'd think they'd be at least somewhat informed about that, enough to be hesitant about announcing that deal before a proper medical is done.