Arjen Robben holds his thigh after injuring himself during a friendly international football match against Hungary on June 5, 2010. Robben is a doubt for the World Cup after injuring his left thigh in the Netherlands' 6-1 friendly win over Hungary today, Dutch coach Bert van Marwijk said. ((TOUSSAINT KLUITERS/AFP/Getty Images))

Netherlands coach Bert van Marwijk says injured winger Arjen Robben is on his way to South Africa and will join the squad Saturday.

Van Marwijk says Robben's recovery is "going well" but was evasive when asked whether Robben would be fit to play in Monday's Group E opener against Denmark.

Speaking to reporters after practice Friday, the coach said: "I haven't seen him for a week. We will see tomorrow."

Robben has been in doubt for the World Cup since picking up a hamstring injury a week ago in a friendly against Hungary.

With plenty of midfield talent in the squad, Van Marwijk may choose to rest him for the opener. Judging by Friday's practice,

Real Madrid's Rafael van der Vaart could take Robben's place in the lineup.