The Northern Ireland Under-23 team's hopes of qualifying for the semi-finals of the International Challenge Trophy ended with a 2-0 defeat by Portugal.
The Irish League part-timers enjoyed much of the possession but two second-half strikes killed off their hopes.
Orlando Sa put the home side in front in the 63rd minute on Tuesday night and Castro added the second with a 25-yard screamer past Chris Keenan after 74.
Northern Ireland had beaten Poland in their last match in Coleraine.
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