Aubameyang, who joined from Saint-Etienne at the start of this month, said that he did not give the opportunity to make the move a second thought.
"It was an easy decision," Bundesliga.com quotes Aubameyang as saying. "I came here because BVB are a massive club that can help me become a better player.
"I don't see myself having any difficulties playing here because this team is full of world-class players."
Aumbameyang scored 37 league goals in two seasons for St-Etienne.