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Portugal's youngest players during the 1990 season, and their age in years and days on the occasion of their final appearance, starting or coming on as a substitute.
For each player age is measured in days, and in years and days, from their date of birth to the day of their first appearance.
| Player | Age (Y:d) | Age (days) | Match |
|---|---|---|---|
| Paulo Sousa II | 22:229 | 8265 | 15 Nov 1989v Czechoslovakia |
| Pacheco Domingos | 22:349 | 8385 | 15 Nov 1989v Czechoslovakia |
| Jorge Ferreira | 23:166 | 8567 | 31 Aug 1989v Romania |
| Paulo Futre | 23:190 | 8591 | 06 Sep 1989v Belgium |
| Paneira | 23:196 | 8597 | 31 Aug 1989v Romania |
| Rui Barros | 23:286 | 8687 | 06 Sep 1989v Belgium |
| César Brito | 24:314 | 9080 | 31 Aug 1989v Romania |
| Venâncio | 25:283 | 9415 | 31 Aug 1989v Romania |
| Jaime Magalhães | 27:43 | 9905 | 31 Aug 1989v Romania |
| Carlos Xavier | 27:217 | 10079 | 31 Aug 1989v Romania |
| João Pinto | 27:283 | 10145 | 31 Aug 1989v Romania |
| Sobrinho | 28:124 | 10351 | 06 Sep 1989v Belgium |
| Adelino Nunes | 29:13 | 10606 | 20 Sep 1989v Switzerland |
| Rui Águas | 29:124 | 10717 | 31 Aug 1989v Romania |
| Silvino | 30:179 | 11137 | 31 Aug 1989v Romania |
| André | 31:250 | 11573 | 31 Aug 1989v Romania |
| Frederico | 32:167 | 11855 | 20 Sep 1989v Switzerland |
| António Veloso | 32:212 | 11900 | 31 Aug 1989v Romania |