When Manchester United signed a relatively unknown French youngster for a whopping £36 million last season, it's safe to say a few eyebrows were raised across Europe.
Anthony Martial showed plenty of promise from his first campaign in English football to indicate he could well be worth every penny and his value has already risen beyond the initial fee paid to Monaco less than 12 months ago.
That's according to a Soccerex report from Prime Time Sport, who have released a document listing the most valuable players under the age of 21.
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Martial heads the rankings in a star-studded list which also includes England's very own Dele Alli and Marcus Rashford.
The Soccerex study claims the young French star is now worth £39.7 million, over £8 million more than the Manchester City target Leroy Sane in second place.
The latest reports suggest Pep Guardiola's new side could pay Schalke £42 million for the German's signature - £10 million more than the report claims he is actually worth.
Meanwhile, Tottenham's Alli (£28.8 million) is only just pipped to third by Euro 2016 star Renato Sanches (£29.1 million) and Rashford's recent stunning rise has earned him a very respectable seventh spot.
Sanches isn't the only Bayern Munich star to feature as Kingsley Coman rounds off the top five with a valuation of over £25 million.
Perhaps most surprisingly, the list doesn't feature a single player from La Liga, with the top 20 dominated by the Premier League and Bundesliga.
The Prime Time Sport Football Value Index consider each player's age, position, goals, contract, injury record and caps amongst a large list of other criteria to estimate how much they are worth.
But for Martial, it represents another proud milestone in his fledgling career.
His 17 goals in all competitions last season would have been a crucial factor in his rise and he became a key man for United over the course of Louis van Gaal's stuttering campaign.
The 20-year-old has been given extra time off after Euro 2016 to recover ahead of the new era under Jose Mourinho and wasn't included in the 25-man squad that have arrived in China to play two matches over the next week.
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