The 24-year-old, who joined the club from Saint-Etienne this summer, is also hopeful that they can reclaim the Bundesliga title from Bayern Munich.
"My dream - and the dream of the whole team - is to be German champions once again and get back [and win] the Champions League final. I hope we can do that in these five years," he told Der Welt.
"Bayern have a great team and great players. But that you can also beat them, as you saw in DFL-Supercup (which Dortmund won 4-2). Nevertheless, Bayern are currently not only the best in Germany but also in Europe."
Bayern won both the Bundesliga and the Champions League last season.