Robert Lewandowski tops the list. According to Transfermarkt, the Poland international was worth €50m at the time he moved from Borussia Dortmund to Bayern Munich.
Stefan de Vrij moved from Lazio to Inter in 2018 when he was worth €40m.
German Leon Goretzka is third on the list. He left Schalke to Bayern Munich in 2018, when Tranfermarkt valued him €40m.
Aaron Ramsey (Arsenal to Juventus, 2019, €40m) and Michael Ballack (Bayern Munich to Chelsea, 2009, €35m) are also in the top ten.
Henrikh Mkhitaryan, who moved from Arsenal to Roman this year, is 28th on the list. Transfermarkt puts his current value at €20m.