Statements made by Defence Minister Claus Hjort Frederiksen suggest that Denmark may be required to accept the return of citizens who have fought for the group, reports broadcaster DR.
Several hundred Isis fighters are currently imprisoned in Syria, where the movement has gradually been subdued in recent years. A number of the captured individuals are Danes.
“We are working on finding out how many there are. We must then take a look at their cases,” Frederiksen told DR Nyheder.
The minister’s statements come after a meeting between countries taking part in a military coalition against Isis, including Denmark. The United Stated reportedly made it clear it would prefer home countries of the militants to take them back.