Celtic are eyeing up a summer move for HSV Hamburg defender Stephan Ambrosius, whose contract at his current club expires next summer.

That’s according to BILD, who report that the centre-back’s negotiations over a new deal at the 2.Bundesliga club have hit a snag.

They explain that last week, sports director Michael Mutzel and the player’s agent Nochi Hamasor sat down to discuss a new deal for the 21-year-old.

After the meeting things ‘seemed positive’ and a new four-year deal was ‘within reach’.

However, since then there is now ‘fire in the story’ as Celtic ‘pops in-between’.

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Neill Lennon’s side want Ambrosius and are ‘not averse’ to a deal in January, despite the fact they would have to pay a small fee.

So far his agent has refused to comment on the speculation, but has confirmed a break in talks, telling the newspaper ‘our goal was to keep Stephan in Hamburg. After the Bochum game, however, we broke out’.

HSV, for their part, are planning to ‘get the curve’ in the talks and try to convince him to sign a new deal.

They have already ‘been informed’ of that interest, with it claimed that it would be ‘painful’ for them to lose the youngster, who has been at the club since 2012, in this manner.

Celtic, though, are seemingly keen on his signature and if they can’t get a deal done for January, they are also free to sort out a deal for the summer, meaning the ball is very much in their court.