Off contract at Real Madrid in June, Luca joins Rayo on a free transfer and has signed a two-year contract.
The France U20 international said, "Rayo is a great club.
"I really want to start and do great things. I am very happy to be here, to be part of this squad and I hope we achieve our goals.
"I hope to grow, enjoy what I like to do the most and help the squad."
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