AS Roma have made public the details of their signing of Erik Lamela.
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.