Answer
Werder Bremen was the opponent in Edin Terzić's debut match as head coach of Borussia Dortmund. Terzić took over the reins of the German club in December 2020, replacing Lucien Favre. The match against Werder Bremen was a Bundesliga fixture, which Dortmund won 2-1. Terzić's first match in charge was a successful one, setting the tone for his tenure as head coach.