Vincent Janssen lost 20 minutes of his memory after a heavy collision with Simon Mignolet in Netherlands' 1-1 draw against Belgium on Wednesday.
Davy Klaassen gave Danny Blind's team a 38th-minute lead from the penalty spot in Amsterdam, by which time Stijn Schaars and Janssen had already been forced out of the action.
Jeremain Lens suffered a pulled hamstring before Yannick Carrasco hit a deflected equaliser eight minutes from time, but it was the injury to Tottenham striker Janssen that caused the most concern to Blind ahead of Sunday's World Cup qualifier against Luxembourg.
"Vincent Janssen is going to be a very difficult story," he told reporters. "The physician told me it is a concussion. He lost 20 minutes of his memory, and doesn't know what happened.
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