Zambia lost 1-0 to Costa Rica in their final Group C game at the Under-20 World Cup in South Korea on Saturday.
The Junior Chipolpolo, who had already booked their place in the next round, were beaten by a 15th minute goal from Jostin Daly.
The result in Cheonan ensured that Costa Rica would join Zambia and Portugal in the last 16.
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Portugal were 2-1 winners over Iran in Incheon in the other Group C match, leaving Zambia as group winners.