The left-back says Brazil's tense penalty shootout victory over Chile in the round of 16 took a toll on both the players and the fans, but is confident of being crowned champions
The Selecao needed penalties to decide the game after it finished 1-1 and were fortunate not to concede when Mauricio Pinilla hit the crossbar in the dying seconds of extra time.
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“To win the World Cup, you have to know how to suffer,” he said.
“We learned to suffer. Julio Cesar had to save us. He was [one of the] most nervous, but then he was solid. We are now moving on to be champions.
“Emotionally, everyone was dead. It was a test that we passed. I looked at the crowd, there were people screaming and crying. Winning was a joy.
Brazil will face Colombia in the quarter finals, a side who have won every game at the World Cup so far and in James Rodriguez, boast the top scorer and one of the stars of the tournament.
“Colombia have a great squad and many talented players,” Marcelo continued. “But we are the Brazil team and we play with everything.
“From the first game we are evolving. We improved a lot but we’ll talk to [coach Luiz Felipe] Scolari and see where else we can improve.”