3) Kyriakos Papadopoulos (Schalke)
This 22-year-old Greek defender has enjoyed the long-term admiration of Liverpool, amongst a number of top European clubs. Unfortunately, his development has been restricted by injuries in recent years, with just 14 Bundesliga appearances to his name in the last two seasons. An excellent tackler and strong in the air, if he can return to his form of two years ago he could be a bargain buy for a number of top clubs.