Besiktas have confirmed the full transfer of Manuel Fernandes following the end of his loan spell from Valencia.
The Portuguese international midfielder, 25, joined the Turkish club in January on loan and was expected to return to Spain after the deal expired.
However, Besiktas announced on Friday that he has signed a three-year deal.
They will pay Valencia €2 million for his full rights - a massive discount on the €18m the Spanish side paid Benfica for Fernandes in 2007.
The player will be paid €2m for the 2011-12 season, with his salary rising by €100,000 in each of the following two campaigns.
An announcement from Besiktas to the stock market in Turkey confirmed those details.