The midfielder urges his side to prepare properly for their World Cup meeting with Australia rather than coasting on their 5-1 win and pinpoints Tim Cahill as a major threatNetherlands midfielder Nigel de Jong demands that his team-mates do not get lost in the "euphoria" of their 5-1 win over Spain.
Louis van Gaal's men stunned the reigning world champions as they took them apart in their opening match of the World Cup on Friday, with two goals apiece from Robin van Persie and Arjen Robben as well as a Stefan de Vrij header.
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"I understand that the euphoria is very large after the 5-1 against Spain," the AC Milan man told reporters, "but we have to give everything against Australia. [Sunday] was actually a recovery training session because the 48 hours after a game is often the hardest.
"In the first five minutes of the second half we started well. In the back we were compact, we won the duels and everyone worked hard. We looked at each other and were like [sic], this is going to happen today.
"Of course it was a fantastic victory but it is only a group match. We have achieved nothing yet. We are going to focus on the game against Australia."
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"I have often played against him in England," the midfielder recalled. "He is a player who plays with his heart. He is a good header [of the ball] and often gets into the right places from crosses. Of course we should keep a close eye on him."
Left-back Daley Blind - who contributed two assists against Spain - missed some of the Dutch team's training session on Sunday with a knee injury but allayed any fears that he might not be fit to feature on Wednesday.
"As a precaution I stayed inside," the Ajax man explained. "I had slight problems with my knee. I don't expect any problems for the match against Australia."