In the summer of 2010, largely unknown Japanese made a €350,000 switch to Borussia Dortmund and hardly anyone could have expected Kagawa to reach the heights he has managed to and eventually earn himself a move to Old Trafford.Kagawa wasn't a first team choice upon his arrival for Jürgen Klopp, but managed to have a fine season at Dortmund, bagging 12 goals in 28 appearances, though he spent half the season on the sidelines due to his injury he picked up playing for Japan national side. His next season was a lot more successful. Kagawa managed to make 43 appearances and score 17 goals, helping his team defend the Bundesliga title.Having just 1 year remaining on his contract, Kagawa attracted a lot of attention, as many clubs wanted a bargain deal for the attacking midfielder. He eventually made a move to Manchester United for an undisclosed fee, believed to be in the region of €15M, but Borussia wasted no time in finding a replacement. They activated a release clause in Marco Reus' contract and paid Borussia Mönchengladbach a sum of €17.1M for the German who scored 21 goals in 37 games for Mönchengladbach in season 2011/12.Marco Reus has spent majority of his youth career at Borussia Dortmund, training with their youth system from ages 7 to 17, when he finally made a move to Rot Weiss Ahlen.Both players have made strong starts for their clubs, Kagawa scoring twice in 5 league appearances for Man Utd, while Reus already has 4 goals to his tally in total of 6 games. There's little doubt that Dortmund will miss Kagawa's creativity, but it is fair to say that Reus' goalscoring ability will more than compensate for his departure, provided that Reus continues his fine form.