I want to go through the amortization thing once more.
Nainggolan's case is this:
Book value: 19m€
Contract length: 2 years
=> annual amortized value is bookvalue/remaining so it is 9.5m€
If he stays in our books, thus we keep him or loan him, we need to cover 9.5m€ of his book value, the annual amortized value. Covering means we need to have 9.5m€ this fiscal year in the income statement, meaning we need to generate 9.5m€ revenue to have Nainggolan in our books.
The rumor goes he's going be loaned for 3m€. This means we would need to cover 6.5m€ this fiscal year to have Nainggolan play for Cagliari. Next year, they would be obligated to buy him for 9m€ while Radja's book value would be by then 9.5m€. This means we would register 500k€ capital loss (actually 800k€ since his value is like 19.3m€ or something in the books).
Then salary is completely another story and I'd say there's no way we can cover any of his salary (annual gross salary 8.3m€) this season or the next to make any sense of this deal if it happens with these numbers. With these numbers, we would make small saving this season in terms of total costs of the player, but also we wouldn't have the player in our usage obviously.
Generally these numbers seem very unimpressive for a player like Nainggolan and we look like a fucking supermarket for small clubs with these terms. Hopefully it will be something better.