 Complete the following phrase:  Darko Kovačević born 18 November 1973 is a Serbian former professional footballer who played as a forward. He began his career in Serbia with Proleter Zrenjanin and subsequently played for Red Star Belgrade, with whom he won a Yugoslav League title and two Yugoslav Cups. His prolific performances earned him a move to Premier League side Sheffield Wednesday, although his time in England was less successful. He is mainly known for his spells at Real Sociedad where his offensive partnership with Nihat Kahveci was one of the best in Spain. Kovačević also had positive spells with Italian club Juventus and Greek side Olympiacos. Internationally, he represented Yugoslavia at the 1998 FIFA World Cup and at the 