2. Marco Reus
Dortmund legend Marco Reus could follow his German compatriot Mats Hummels out of the door at the Signal Iduna Park when his contract reaches its end this summer. Reus who has represented Dortmund 411 times has been one of the few players to have stayed the course at the German club.
The 34-year-old is still one of Dortmund's key players and has moved past his injury-riddled phase playing over 25 Bundesliga games for Dortmund in each of the last two seasons and missing only four games this campaign.
This season, his eight goal contributions is the fourth-highest among Dortmund players showcasing that the German can still be an effective part of any European side, be it at Dortmund or elsewhere.