Jackson Irvine, Lukasz Zaluska and Joe Chalmers are also out of contract this summer.
The season is coming to an end and with the international break clubs have plenty of opportunity at this moment in time to consider who will remain at the club and who will not.
That includes those whose contracts are coming to an end.
Six players at Celtic become free agents in the summer, so who should stay and who should go?
Lukasz Zaluska - STAY
The Polish stopper is an able second choice and if he was willing to stay Celtic would be silly not to keep him on board.
Worth keeping, along with ...
Leo Fasan - STAY
The Italian has impressed for the under-21 side this season and should continue to be Celtic's third choice stopper.
Joe Chalmers - GO
The left-back made his debut in 2012. Now, three years later, he has only played two more games for the club - the latest back in February 2013.
Time to go, Joe.
Jackson Irvine - GO
The Australian international has never managed to have an impact at Celtic after arriving from Melbourne Victory in 2010.
He has impressed on loan with Kilmarnock and Ross County but do Celtic need him? Probably not.
John Herron - GO
The 21-year-old has recently joined Cowdenbeath on loan and with Celtic packed full of options in his position it is hard to see him coming back.
Dylan McGeouch - GO
Another player with bags of potential. But with Gary Mackay-Steven and Stuart Armstrong recent arrivals, his return seems unlikely.