Klaas-Jan Huntelaar has admitted that he remembers little of his collision with Chris Smalling during the Netherlands' 3-2 defeat of England on Wednesday.
Both players were taken to hospital when they had clashed heads in the build up to Huntelaar's goal in the friendly at Wembley Stadium.
"Personally, I knew nothing more [after the collision]," the striker told De Telegraaf.
"I still have a headache, a swollen and bruised nose and a concussion. If I cough, it feels like my brain is still shaking!"
The 28-year-old is expected to sit out of Schalke's Bundesliga clash with Freiburg on Saturday.
