 Complete the following phrase:  Born in Zonguldak, Black Sea, Ergün begun his professional career with Gençlerbirliği SK. After that, in the 1994 summer, he signed with top division giants Galatasaray SK, being one of the teams most influential players in the following decade in a variety of positions, including left back, and playing a very important part in the sides exploits from 19992001, which brought a total of six titles  two domestic doubles, the UEFA Cup and the UEFA Super Cup; in the first competitions 