It wasn't that much, more like €2m.
I doubt it's even that. 2M euros is like 5/6M reais (the value of 1 real in Brazil is similar to 1 euro in Europe - for example, u pay 2.50 for a bus ticket), it's too much. These kids used to play for a 4th division team in Brazil. They've playe like 8 games professionally when bought. But 17yr old Appelt marked Ronaldinho when playing Flamengo, impressed and got famous.
It's not more than 1M euros, I would guess.
Anyway, info for you: Pro Vercelli has an option to buy. But Juventus has an option to buy back. LOL. I'm not kidding. It's just one of those crazy Italian deals.