You have 12 minutes to guess 100 players.
Remember to tweet your scores @FourFourTwo, and challenge some friends while you're at it.
THEN TRY Quiz! Can you name every club Mesut Ozil has ever assisted against?
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There are huge benefits to be had from having young players in your squad.
For a start, they have the enthusiasm and - in some cases - almost naive, boundless energy of youth. They have room to grow, develop and they're like sponges, willing to learn and to soak up information.
But then there's the monetary aspect, too. They're not yet on insanely high wages and with 10, 15 years of football to play in their career, you can sell them on for a healthy profit in a few years.
You could make almost £4bn from these stars, according to Transfermarkt. So who are they?
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