SAO PAULO -- Injured midfielder Nigel de Jong has warmed up with the Netherlands squad on the eve of its World Cup semifinal match against Argentina.

Striker Robin van Persie, who has looked off the pace in the Netherlands' two knockout-stage matches, warmed up separately from the main group of players with defender Daryl Janmaat during the training session.

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It was not clear Tuesday if De Jong is fit to play against Argentina or if Van Persie has a fitness problem. Coach Louis van Gaal was holding a news conference later in the day.

De Jong injured his groin early in the second-round victory over Mexico and there were fears his tournament was over after the Dutch team said he would likely need two to four weeks to recover.