The young winger expressed his gratitude for the attention, highlighting that he had constructive discussions with some high-profile figures in the game.
"I've spoken to Luis Enrique and I thank him for taking the time," Mastantuono told reporters, reflecting on the conversations that helped shape his summer. However, it was a later approach that truly captured his imagination and influenced his decision.
"Then Xabi Alonso called me and it was very convincing, I loved that," he added, emphasising the impact of the former Spain and Liverpool star's personal touch.
Looking ahead, the 18-year-old expressed his excitement to begin training under Alonso and integrate into a squad brimming with ambition. Fans are eager to see how Mastantuono adapts to Real Madrid's tactical demands and the intensity of the top level.