10. Gianluigi Donnarumma (AC Milan) €15 million
Arguably one of the best goalkeepers in the world, Gianluigi Donnarumma is also the youngest player of this countdown with just 17 years of age! His jersey number might be 99, but he’s in fact, the #1 choice for goalkeeping at AC Milan and is the strongest contender to replace Gianluigi Buffon in the Italian national squad. In fact, it was Buffon himself to have labelled the kid as his potential successor! Not only was he the youngest goalkeeper to play for Milan, but also he became the youngest player (at 17 years, 189 days of age) to play for Italian senior squad.