Vanja Dragojevic is relishing the chance to play in "maybe the biggest derby on earth" when Rangers host Celtic in the Premier Sports Cup next month. The 20-year-old midfielder has previously played in Belgrade's 'Eternal Derby' for Partizan, but has been told the Old Firm could surpass that experience. Dragojevic scored his first Rangers goal in Sunday's League Cup win over St Mirren, setting up a quarter-final clash against their Glasgow rivals.