By Matthew Cooper Marco Reus is set to become a free agent this summer after it was announced that he and Borussia Dortmund had “mutually agreed” not to extend his contract. The news comes after Reus’ representatives were pictured attending the Manchester derby at Old Trafford last year. After the match, agent Darren Freeman shared a picture on Instagram alongside colleague Dirk Hebel which thanked Manchester United for having them as their guests. However, since that visit Sir Jim Ratcliffe has purchased a minority stake in the club and taken full control of football operations. As a result, …