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.
Aberdeen have announced that goalkeeper Jamie Langfield has signed a new two-year contract.
The 32-year-old returned to first-team action this month after suffering a brain seizure last summer.
The former Dundee player joined Aberdeen in 2005 and has made 226 appearances for the club.