De Bruyne, 32, was asked about his plans after Belgium defeated Euros opponents Romania.
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But he replied: "I haven't really thought about whether this is the end of my national team career. I don't like to think about when I will retire or about my future.
"I have not decided when I will stop. I have played on this team for 10 years and I have a lot of knowledge to pass on to the younger players.
"But to be completely honest, I have not decided when I will stop."