IHe started playing futsal at the age of 9 and by the age of 13 he was on the books of Fluminense. He comes from a very poor background and even considered quitting football, but his club considered him as one of their 'Crown Jewels' and ensured that he continued playing football. He recently signed for Real Madrid.

He scored on his Brazil debut against Wales, he picked up the ball just outside the Wales box and shot for a traditional Brazilian left back goal. He has been tipped to be the natural successor for Roberto Carlos for both club as well as country.

On Sunday October 22 2006, the agent of Fluminense wing-back revealed the teenager is on his way to Real Madrid. His agent Reinaldo Pitta declared: "The conditions are complete because the transfer will be made officially tomorrow. Only minor details are now lacking." Reports suggest Real will pay £4.3 million / 7 million Euro and Marcelo will sign a 7 year contract (until 2013). Joining Real Madrid in the January Transfer Window, Marcelo made his debut as a substitute in the 2-0 defeat against Deportivo La Coruña. On the 14th April 2007 Marcelo made his first ever start for Real Madrid in a match against Racing Santander a match which Real Madrid lost 2-1.

On his arrival, Club President Ramón Calderón said "He is an important signing for us. 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're very happy because he's a pearl that half of Europe wanted."

It has now been stated that under the new manager, he will be given more of an opportunity to prove himself.