The Brazilian left back believes that the Spanish champions cannot afford to make more mistakes in the season as every match now is like a final.
Real Madrid are going through a sticky patch this term, ever since the start of the new season.
Manager Jose Mourinho led the side to glory in the previous season as his management capabilities brought an end to the domestic dominance of bitter rivals F.C Barcelona.
Barcelona had won the Spanish league on three successive occasions under the management of former coach Pep Guardiola, until the special one stepped in and brought a halt to the Catalan dominance.
Real won the league after a wait of 4 years and did so in a record manner.
However, this season is yet to bring smile on the faces of the white’s supporters as Real have failed to live up to the expectations that are always associated with them.
The Madrid giants are stumbling, especially in the league as arch rivals Barcelona hold a mammoth lead over the capital side. Los Blancos are virtually out of the competition and have no chance whatsoever in retaining their crown, as the Blaugrana look set
to take the title.
Real also have to face English giants Manchester United in the next round of the UEFA Champions League and will have to step up to the occasion in order to gain progression.
Left back Marcelo has acknowledged the mistakes made by the Blancos and has stated that they cannot afford to be sloppy anymore, as the season defining matches will now come every week.
Marcelo also talked about the game against Valencia.
"We will do everything we can to progress. We know that if we make any mistakes we could be out of the competition," Marcelo told bwin.com.
"We always go all-out to progress in every competition we play in. We feel confident because we are playing well and hopefully we will progress.”
"We have to be wary of all their players. Valencia are strong and playing there is difficult, for the fans as well. There is not any particular player to watch, but instead the whole team should concern us."
Real will be facing Valencia tonight in their Copa del Rey clash 2nd leg and are looking to seal progression in the tournament.