Ali Rıza Sergen Yalçın, known as Sergen Yalçın, Turkish professional football manager and former player. He is currently serving head coach of Beşiktaş. Yalçın is the first individual in Turkish football to win the Süper Lig both as a player and a manager with Beşiktaş. During his playing career, Yalçın was an attacking midfielder known for his vision, creativity, and ability to dictate games. Wikipedia