Tottenham striker Vincent Janssen will be closely monitored by medical staff after he suffered memory loss whilst playing for Holland.
The Dutchman collided with Liverpool goalkeeper Simon Mignolet in the 1-1 draw against Belgium on Wednesday night and had to be substituted after just 26 minutes.
“Vincent Janssen is going to be a very difficult story,” manager Danny Blind told reporters.
“The physician told me it is a concussion. He lost 20 minutes of his memory, and doesn’t know what happened.
“We have to be careful with that and talk it through.”
The Netherlands striker is now a major doubt for the World Cup qualifier against Luxembourg on Sunday.