Atletico Madrid coach Diego Simeone as brought his 16-year-old son across from South America.
Giuliano has quit River Plate in Buenos Aires without permission to join his father in Spain.
Diego Simeone has brought his son Giuliano across from River Plate to play for Atletico Madrid.
He will begin playing for Atletico's Under-18 team in the Division de Honor and will remain in Spain for the rest of the season.
River Plate have asked for compensation from the La Liga giants according to Ole, and they are thought to be willing to pay £223,000.
Fifa have approved the move.