De Boer says since arriving at Selhurst Park three weeks ago, people had suggested to him that Puncheon should get the armband permanently and everything he has seen has backed up those comments.
De Boer said: "He has to be an example for the team and understand the philosophy of what we want, and he can be that not just for the first-team players but also for the youngsters and that's very important.
"At the beginning I had a look around and got to know everyone better but I had my information that he would be the best captain and he has proven that in the past three weeks.
"Therefore, for me there was no discussion; he is our captain.
"He knows the responsibility and what that means, and he has to be an example of what Crystal Palace is."
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