Real Madrid have signed Marcelo from Fluminense, for a deal reported to be worth around €7 million.
The 18-year-old left-back has signed a six-year deal at the Santiago Bernabeu and is regarded as the long-term replacement for fellow Brazilian Roberto Carlos.
Marcelo will be free to move to Spain when the transfer window opens again in January.
Club president, Ramon Calderon, was delighted to have captured the promising young full back.
“He is an important signing for us,” the Madrid chief said. “He is a young player who will inject some freshness into the side and is part of our plan to bring younger players into the squad.
“We are very happy because he is a pearl that half of Europe wanted.
“Roberto Carlos is very happy and Marcelo is coming to replace him, when he allows him to!”
