Holland tactician Bert van Marwijk believes that Arjen Robben most probably won't be fit for his side's World Cup opener with Denmark on June 14th. The Bayern Munich ace sustained a hamstring injury during his country's 6-1 win over Hungary in a warm-up match on Saturday after attempting a back-heel pass. "It would be wrong to believe he would be ready to face Denmark," Van Marwijk said. "His injury is serious and I do not know when he can join us."