Shane Duffy is being linked with a move to Championship club Nottingham Forest, who are managed by Chris Hughton.
The Republic of Ireland centre half is currently on loan at Celtic from Brighton.
Duffy has endured a disappointing spell since moving to Parkhead.
The Hoops are currently 21 points behind league leaders Rangers with three games in hand.
Nottingham Forest, meanwhile, sit in 20th position in the Championship, three points outside the relegation zone.
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