There are many, so here are links to videos and articles proving that the best are made here.
Sporting CP Videos
Some video's of the world's best in action.
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Sporting CP Youth Academy
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Top 10 Sporting Graduates
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Road to Sporting Lisbon
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Sporting Performance Lab
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Sporting Academy - BBC Sport
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Sporting FC Toronto
Sporting Articles
Prefer to read? Here's some articles on Sporting CP Academies.
Ranking the Best Youth Academies in World Football
Soccer’s 10 Best Youth Academies
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Sporting CP’s: Figo, Ronaldo & Fonte
Football Times: The Sporting CP Way
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NY Times: Lisbon Club’s Youth Academy Sets It Apart
Read Here