Some of the world's greatest upcoming stars are now even more valuable than ever before. 

As the biggest clubs around Europe look to build sides that can dominate for years to come, managers are in a desperate search for the finest young talent around. 

Many youngsters have already hit the European scene and are already starring for the elite clubs in world football. 

But which clubs possess the most valuable young stars? 

Well, we're here to find out. Using transfermarkt, here's the ranking of the top 10 most valuable under 23 stars in the world: 

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