German centre-back Mats Hummels has admitted that he is unsure whether he will leave Borussia Dortmund at the end of the season.
The 27-year-old has long been linked with a move away from his Bundesliga club, with Manchester United said to hold a long-standing interest.
Hummels will be out of contract at the end of next season and the defender has admitted that he might have to leave the Black and Yellows in search of trophies.
"I don't necessarily want to [leave], but I have to make a big decision. I have been back and forth a lot," Hummels told Bild.
"Age gives you a feeling that you don't have forever to win. I realise in every year I don't win a title, I'm closer to retiring. I've spoken to Ilkay Gundogan and Henrikh Mkhitaryan over their thoughts. The Champions League is a target for me in any case. I want to win this title."
Dortmund will travel to Liverpool for the second leg of their Europa League quarter-final next Thursday with the score locked at 1-1.
