Roma have released the official financial details of Erik Lamela's transfer, which is worth €17m.
The Argentine moved from River Plate last week, but the club only just announced the completion of the deal.
The Giallorossi will pay €12m in three instalments to be completed by July 15, 2012.
The contract also includes performance-related bonuses worth €1m after his 10th appearance for the club, another €1m after his 20th game and a further €3.06m for various targets.
This means that all told Lamela should cost Roma €17.06m.