Robin Hack has opened the door for a January move to Celtic after admitting he would be willing to listen to offers for him.
The Arminia Bielefeld striker was linked with a transfer to the Hoops in the summer, with Swiss side FC Basel also reportedly interested in the 24-year-old.
Hack opted to stay in Germany and has been a huge success at the Bundesliga II club this season scoring nine goals in 19 games and contributing with six assists too.
He previously played for Nurnberg and Hoffenheim. That's led to further speculation in his homeland that the former Germany Under 21s forward will be leaving the club, although he still has two-and-a-half years left of his contract.
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