7 clubs which are the masters of the transfer market

4) Borussia Dortmund

Dortmund have made many a world class player at the Signal Iduna Park

Few clubs have been as efficient as Borussia Dortmund in the transfer market. The German club regularly lose their star players to big teams from around the world, most notably their direct rivals in the Bundesliga, Bayern Munich.

Like clockwork, during every summer transfer window, some of the biggest names in the Dortmund squad march out of the team. However, they are invariably replaced with players of equal calibre, or by youngsters who go on to realise their potential and develop into world class players.

Until recently under Jurgen Klopp and now Thomas Tuchel, the club have never spent exorbitant amounts of money on any single player, preferring to buy cheap and sell high.

This season Ilkay Gundogan, Henrikh Mkhitaryan and Mats Hummels have all moved to other clubs for a combined total of £90.95m, and Tuchel brought in some really exciting players. Andre Schurrle, Mario Gotze, Ousmane Dembele and Emre Mor make for some brilliant attacking signings, while Raphael Guerreiro, Sebastian Rode and Marc Bartra have been brought in to reinforce the defensive side of the team.

PLAYER	BOUGHT FROM	BOUGHT FOR	SOLD TO	SOLD FOR	PROFIT
Mario Gotze	Hombrucher SV Jugend	Free transfer	Bayern Munich	£31.45m	£31.45m
Mats Hummels	Bayern Munich	£3.57m	Bayern Munich	£32.3m	£28.73m
Ilkay Gundogan	1.FC Nuremberg	£4.68m	Manchester City	£22.95m	£18.27m
Shinji Kagawa	Cerezo Osaka	Free transfer	Manchester United	£13.6m	£13.6m
Henrikh Mkhitaryan	Shakhtar Donetsk	£23.38m	Manchester United	£35.7m	£12.32m