1. Lucas Moura (Sao Paulo to Paris Saint-Germain £44.3m)
No player under the age of 21 has commanded a bigger fee than Lucas when his 20-year-old version made the switch from his native Brazil to PSG in January 2013.
Due to strong interest from Manchester United and Inter Milan, PSG were forced to pay over the odds for the winger, but he is now developing into a key player for the French treble winners.
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