It was widely believed Manchester United had over-paid for Anthony Martial this summer, and a new study by the CIES Football Observatory proves just how severe the Red Devils' over-expenditure on the 19-year-old was.
The France international forward sits top of a 20-man list of the most over-paid players in the summer transfer window.
The Old Trafford club, in fact, paid €27.9 million (£20.4m) more than they should have for the former AS Monaco man, according to CIES.
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United finalised a deal for Martial on transfer deadline day, and CIES claim the transfer fee, excluding add-ons, stands at €50m. The study suggests that the striker's value was actually around €22.1m.
The talk of whether the Red Devils over-paid for the forward will be put to bed, if he can hit the ground running in the Premier League, but if he fails to find his feet quickly the pressure may begin to mount on the young forward.
However Man United did well to get as much as they did from the Angel di Maria deal. The Argentinian sits fourth on CIES' list, with the study suggesting his €63m transfer fee was €15.3m more than the now-PSG man was worth.
In addition to United's over-priced deal for Martial, they lost out on a significant amount of money in the sale of Robin van Persie.
Turkish side Fenerbahce signed the Dutch striker for €5.5m after three seasons at Old Trafford, but according to the study, United could have demanded more than double that fee for the 32-year-old.
CIES place Van Persie fourth on their list of most under-paid players, claiming the former-Arsenal man was valued at €16.9m, €11.4m more than they received for his services.
They also over-paid by €10.2m for Morgan Schneiderlin, as the French midfielder was valued at €23.8m.