Arjen Robben of The Netherlands hurt himself in this friendly on June 5 against Hungary. He hopes to return to the lineup before the end of the first round. ((Peter Dejong/Associated Press) )

Arjen Robben has been ruled out of the Netherlands opening World Cup game against Denmark, after flying in to join his teammates six days late because of a hamstring injury.

Dutch coach Bert van Marwijk said Saturday it was too risky for the Bayern Munich winger to play at Soccer City on Monday. But he hopes Robben will be fit in time to face Japan in Durban on June 19 and Cameroon in Cape Town five days later.

Van Marwijk said Robben virtually had only one full training and he was going to "take it easy" with him.

Robben picked up the injury in a warmup game against Hungary in Amsterdam on June 5.