England goalkeeper Fraser Forster does not know if he will still be at Celtic when they next play in Europe.
Norwich captain Sebastien Bassong has signed a new two-and-a-half-year contract.
The 27-year-old joined the Swans in the summer of 2011 when Brendan Rodgers paid Watford more than £3million for his signature.
But since Michael Laudrup took charge, Graham has struggled to command a regular place - starting less than half of their league games so far this term.
Graham has scored five goals so far this term, including two in his last two games.