Japan's national team experienced another injury when defender Daiki Iwamasa was hurt at training.
The Kashima Antlers man suffered a deep gash in his right leg and looks certain to miss Saturday's clash with Holland in Enschede.
''He has cut his leg and will need stitches. He probably won't be able to play against Holland,'' Okada said of Iwamasa.
After the Holland match, Japan meets African nation Ghana in Utrecht on Wednesday.