The 26-year-old left-back insists Brazil won't be taking Cameroon lightly, that the hosts will continue to improve with every game and pledged his support to striker Fred
The Selecao opened the campaign with a 3-1 victory over Croatia before a goalless draw Mexico and now require at least a point against the already-eliminated African side in Brasilia to assure theur place in the round of 16.
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"At the World Cup there is no easy game," said Marcelo.
"We know what to expect from Cameroon, they are strong and have lots of quality. We must go into the game and do our job. We always respect the opposition."
The Real Madrid defender also pledged his support to striker Fred, who is yet to find the net in the competition, and said that he is sure the five-time world champions will continue to improve with each game.
"We don’t only give the ball to Fred [to score]," he added. "It is everyone’s job.
"We still have to improve some things, but we will improve by playing.
"I felt an evolution of the first game to the second. We saw the improvement, and that is our goal."
Should Brazil meet expectations and make it out of Group A, a mouthwatering Round of 16 clash will await them against the dynamic enterainers of Chile or The Netherlands, who have both already ensured that they will both progress from Group B.