Former Barcelona footballer Douglas also played for Sporting Gijon, Benfica and Sivasspor on loan in last 3 seasons
Brazilian defender Douglas Pereira Dos Santos signed a three-year contract with Turkish top-tier football club Besiktas.
28-year-old defender joined the Turkish club with a three-year deal, Beşiktaş said in a statement in their official website on Saturday.
He scored 3 goals in 32 matches last season for Turkey's Sivasspor.
The former Barcelona footballer has also played for Sporting Gijon, Benfica and Sivasspor on loan in the last 3 seasons.