Luka Jovic is one of the youngest to feature on this list, but at the age of 17, he's already notched up 7 goals in 22 games up front for Red Star Belgrade while the hotshot Serb has also netted 4 in 7 for his country's under 19 team. Arsenal have been strongly linked with a move, with a reasonable fee of around £3 million being touted. At that price, he could be well worth a bid, especially if you're the type of manager who hoards young players from around the globe in the hope that they develop from very good players, to world class level.