Besiktas JK have signed Volkan Ünlü and Ali Tandogan while Sergen Yalçin and Oscar Córdoba agreed new deals.
The 21-year-old joins from FC Schalke 04 where he was understudy to veteran Frank Rost, making four appearances last term for the German Bundesliga runners-up. Besiktas will pay a nominal compensation fee for Volkan, whose move ends a seven-year stint in Gelsenkirchen. He is likely to be second choice at Besiktas behind Colombian Oscar Córdoba, who has agreed a new two–year deal.
Another key player committing his future to the Istanbul side is midfielder Sergen Yalçin, who has extended his stay at the Inönü stadium by an undisclosed number of seasons. "I was born at Besiktas, and I will leave football at Besiktas," said the 32-year-old.
The former Turkish international will be playing alongside Ali Tandogan next term after the 27-year-old midfielder's arrival from Gençlerbirligi SK. The ex-Turkish U21 international was out of contract and has signed a three-year deal with a further one-year option.