Franco Mastantuono. The 17-year-old, who will join in August upon turning 18 as per FIFA rules, has signed a six-year contract at the

Real Madrid sign 17-year-old Franco Mastantuono, the youngest player to ever feature for Argentina, from River Plate.

Taking advantage of the official announcement yesterday afternoon, Real Madrid wanted to give a gift to its fans. The official account of the white club published a video with the highlights of their new star. The Argentine, only 17 years old, is a special player as can be seen in the video published by the club's account.