The Spain international has developed into one of the most sought-after players since joining Malaga from Valencia in the summer of 2011, and his rise to prominence has not gone unnoticed in Germany.
"Isco is a genius. He is a natural and a huge talent," Reus was quoted as saying by AS.
The gifted attacker then went on to single out Martin Demichelis as another key player for the Liga side, while stressing that Malaga cannot be underestimated.
"I also know Demichelis, who spent several years at Bayern Munich and has a lot of quality. Malaga have a great team that can trouble a lot of opponents," Reus explained. "They are having a superb season, despite some internal struggles. They won against AC Milan and eliminated a strong team like Porto."
The first leg of the quarterfinal tie between BVB and Malaga takes place at La Rosaleda on Wednesday.