His 28-minute cameo impressed fans, and Mastantuono made history by playing his first game at Real Madrid in La Liga. Mister Chip from ESPN Deportes reports that Mastantuono became the third youngest foreign player to make his La Liga debut with Real Madrid.

The Santiago Bernabéu witnessed a special moment in the opening matchday of LaLiga 2025/26: the official debut of Franco Mastantuono in a Real Madrid shirt. The 18-year-old Argentine came on in the 67th minute to replace Brahim Díaz,