By Jeorge Bird For Mailonline
Published: 12:26 GMT, 2 January 2019 | Updated: 13:02 GMT, 2 January 2019
Borussia Dortmund have frequently managed to make a significant profit on players, with Christian Pulisic the latest example.
The winger joined Dortmund as a youth player on a free transfer but has now signed for Chelsea for £58million, although he will spend the remainder of the campaign back on loan at the German club.
Dortmund have also previously made a