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.
Lille midfielder Idrissa Gueye has agreed a three-year contract extension.
The 23-year-old Senegal international is now tied to the Ligue 1 club until the summer of 2018.
Gueye was a member of the Lille squad that won a league and cup double in 2011 and has made 80 league appearances since his debut in 2010.