His arrival was made official at a ceremony in which president Florentino Pérez welcomed him. The event took place after the talented footballer passed the relevant medical examinations, having been in the Spanish capital for several days.
After a video compilation of the former River Plate player's best moments, the Los Merengues president took the floor to welcome his new reinforcement:
"We are just a few days away from the start of a new season and the madridistas are once again excited about the challenges that lie ahead. We all feel proud to be part of the great madridista family. This crest is the symbol of a feeling. We are living through a period that will be remembered as one of the most successful in our history.
"One of the greatest talents that the world of football has produced in our days has arrived at our club. Today we welcome Franco Mastantuono. Congratulations, because today your great dream comes true on your birthday. Today is one of the most important days of your life and also for your family. We are very proud to see you happy and facing the challenge of your life.
"I want to have a special mention for River Plate. It was there that Alfredo di Stéfano emerged, who laid the foundations of what we are today. Dear Franco Mastantuono, today you join the long list of Argentine players who have made history at Real Madrid. You are on your way with the Real Madrid shirt after becoming the youngest player to make his debut with the Argentine national team and the youngest to score for River Plate. Thank you very much for wanting to be here with us."
An unbeatable gift
After Florentino, it was the turn of a jubilant Mastantuono to take the floor:
"Dear president, thank you very much. It is a special day for me. It's a dream come true for me as a player and as a person. It will be a day I will remember for the rest of my life. I wanted to thank my people, they are indispensable to me. I love them very much. I want them to enjoy it as much as I do.
"I have to keep learning a lot, but I thank my inner circle for the values they have passed on to me. Today begins the dream of wearing this shirt. Thanks to all the people at the club for giving me this opportunity. You can count on a fan on the pitch, Hala Madrid!"