Dortmund interested in Milan defender
The Swiss defender joined the rossoneri in the summer of 2017 from Wolfsburg for a fee of 15 million euros plus bonuses of around 2 million euros. He has taken some criticism for his performances in recent weeks.
Sky in Germany say that BVB are keeping a keen eye on the 27-year-old left-back and could make a move for him in January. It is unknown whether Milan would be open to letting him leave.