Germany international Reus was substituted at half-time in the 2-1 win at Berlin's Olympiastadion.
Show featured German singer Helene Fischer, who was jeered by sections of the crowd at Borussia Dortmund's 2-1 win over Eintracht Frankfurt.
Marco Reus is facing six months out with cruciate ligament damage picked up in Borussia Dortmund's DFB Pokal final win against Eintracht Frankfurt.
Ousmane Dembele opened the scoring and Christian Pulisic starred in the second half as Borussia Dortmund won their first DFB Pokal title since 2012.
It was fittingly a struggle but Borussia Dortmund ended their cup drought with a DFB-Pokal win over Frankfurt. Now difficult questions await the club.
Thomas Tuchel said he would like to stay on as Borussia Dortmund manager next season after securing the DFB Pokal title on Saturday.