3. Marquinhos

Age: 19

Nationality: Brazilian

Club: Paris Saint-Germain

As the fifth most expensive teenager of all-time and fifth most expensive defender of all-time, it would be a shock not to see Brazilian centre-back Marquinhos on this list.

The youngster joined PSG from AS Roma for a staggering €31.4million fee last summer but has struggled to displace his compatriots Thiago Silva and Alex thus far.

Although at 19, he has plenty of time to reach his massive potential.

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