The Portuguese club have certainly made a tidy profit in the last decade.
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Although most of the big clubs in European football are famed for spending huge amounts of money on players, since 2004 FC Porto have been making plenty on outgoing transfers.
The £32m sale of Eliaquim Mangala to Manchester City is just the latest in a host of expensive departures from the Estadio do Dragao over the past decade and here are the 10 biggest deals.
10. Ricardo Carvalho to Chelsea, 2004 – £19.85m
Having helped Porto to Champions League success in 2004 under manager Jose Mourinho, the coach then bought the centre-back with him when he took charge at Stamford Bridge.