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.
Watford striker Chris Iwelumo has joined Oldham on loan until the end of the season.
The 34-year-old joined Watford in 2011 and scored five goals in 47 appearances before playing five times for Notts County on loan earlier on this campaign.
Iwelumo has four Scotland caps to his name and counts Stoke, Colchester, Charlton, Wolves and Burnley as former clubs.