Mariano was presented to the local media on Friday after his return from Olympique Lyon.
Florentino enthused: “Every time we welcome a great player, we madridistas feel a sense of great joy. But today, this is a particularly special occasion since we are welcoming back one of our own. It marks the return of a player who came through our academy and who understands the values and principles which have led to us becoming the most prestigious and admired football club in the world.
“Coming back home is a young player for whom we have had real hope for a number of years. He's shown his quality and his talent over the last year in the French league and he's earned this opportunity to once again be part of the Real Madrid first team.
"There's nothing more satisfying for the millions of Madridista fans across the world than seeing one of our very own coming home after showing the quality he possesses."