Manchester United transfer target Mats Hummels has revealed he's open to a move away from Germany - but only when the time is right.
The German international has emerged as an option for United, who have struggled with injuries to key defenders, but the 23-year-old only signed a new five-year Dortmund contract in June.
Hummels helped Jurgen Klopp's side to back-to-back titles and a German Cup last season. And his excellent performances led to speculation that Manchester United or Barcelona could move for the centre-back.
Hummels put that speculation to bed by signing a new deal in Germany, but he has since revealed a move abroad is not out of the question.
On FourFourTwo.com, Hummels said: "One day I will say that I am keen on a transfer. To play football in a new country would be flattering.
"I already had offers and one enquiry from these offers was really one of interest for me. But I told myself that that time is not right for such a move.
"In the Bundesliga it would just be about Bayern Munich, but this club has no shortage in my position. In Europe there are just about four to five clubs that would really interest me."
Due to their current injury crisis, Manchester United do have a shortage in Hummels' position. Chris Smalling, Phil Jones, Jonny Evans and Nemanja Vidic have all spent time on the sidelines this season, and Rio Ferdinand does not have the best injury record.
Hummels is one of the most talented defenders in the Bundesliga and already has 22 caps for Germany.
The former-Bayern Munich academy graduate left for Dortmund in 2009 and has flourished under Klopp but Sir Alex Ferguson could yet tempt him to join Manchester United at Old Trafford.