Alfie Doughty with just six months remaining on his contract. The left-sided midfielder has been a long-term target for Celtic, who could open talks about a pre-contract this month.
Rangers have also been linked with a move for Doughty, while Stoke City have made a bid for his services. The Scottish Premiership top two are free to negotiate with the 21-year-old from this month but the English outfit would have to wait until the final weeks of his Charlton contract and are keen to land him in January.
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