The Swiss centre-back, signed from Basel in January, has starred for Dortmund as the club have surged back to the top of Bundesliga.
“Many know that Manchester United has been my favourite club since childhood,” the 23-year-old told Bluewin.
“It would be nice to play there, but that’s not an issue right now.
“I am very satisfied in Dortmund. I want to win titles with BVB and compete in many more big tournaments with the Swiss national team.”