The Brazil star was pleased with his side's showing as they beat Cameroon to seal top spot in World Cup Group A but warned his team-mates there will be no more room for errors
The hosts hammered Cameroon 4-1 on Monday night to seal their place as Group A winners and set up a last-16 clash with Chile.
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"Now the World Cup begins for real," he said. "We have passed through the group stage and go on to the knockout round, where mistakes are far more expensive.
"But today's victory was important boost to our spirit and so we move on with better morale."
Neymar struck twice for Scolari’s side, leaving him as the tournament’s top scorer with four goals, before Fred and substitute Fernandinho completed the rout.
And Alves says he was happy with the performance overall but warned of the threat posed by Chile’s Alexis Sanchez.
"I think we were generally pretty good. But anyway, we will analyze the game to look at our mistakes as well.
"[Sanchez] is a player that unbalances teams. He dribbles well and is very fast… But if we manage to be well positioned as a team, we'll perform our roles well [against him]."
Chile have faced Brazil on all three occasions they have made it to the knockout round of a World Cup, and have been eliminated every time.