Their latest study shows that the 18-year-old France international has seen his stock continue to rise over the last three months, taking his price tag to €182.8 million.
Mbappe has netted eight times in 17 appearances for PSG since joining from Monaco over the summer on an initial loan which will be turned into a €180m deal in 2018.
Sitting just behind the French starlet on the U21 chart is Tottenham’s Dele Alli, with the England international midfielder now considered to be worth €180.2m.
His Premier League rival, Manchester City winger Leroy Sane, is third at €124.5m, while Barcelona’s Ousmane Dembele is still valued at €120.4m despite seeing his rating drop on the back of an injury-hit start to his time at Camp Nou.
Manchester United’s 20-year-old frontman Marcus Rashford completes the top five, with it expected that he would demand a €116.7m fee were he to leave Old Trafford.
Elsewhere, Leicester midfielder Wilfred Ndidi is thought to be worth €64.8m, placing him just above AC Milan’s teenage goalkeeper Gianluigi Donnarumma (€55.7m).
The ongoing development of Marco Asensio at Real Madrid means that he is now valued at €50.7m, while Chelsea have a €47.6m defender on their hands in the form of Andreas Christensen.
Fiorentina’s Federico Chiesa (€52.6m), Roma’s Lorenzo Pellegrini (€50.7m), AC Milan’s Franck Kessi (€47.6m), Monaco’s Youri Tielemans (€46.2) and Real Madrid duo Daniel Ceballos (€43.8m) and Theo Hernandez (€42.8m) complete the top 20.
