Shane Duffy could make his Celtic return against St Johnstone as Stephen Welsh's injury leaves Neil Lennon with a defensive headache.
The young centre-back suffered a nasty knock against St Mirren and
Duffy has struggled since joining on loan from Brighton but it was he who replaced Welsh and the Ireland international could start on Sunday.
James Forrest continues to get up to speed after recovering from ankle surgery, while defender Christopher Jullien is out long-term with a knee injury.
Murray Davidson is St Johnstone's only absentee with a calf injury.
The midfielder is battling to be fit for the Betfred Cup final later this month, but the Perth Saints have no other injury issues.
Potential Celtic line-up
Provisional Celtic squad
Conor Hazard
Scott Bain
Vasilis Barkas
Ross Doohan
Greg Taylor
Diego Laxalt
Stephen Welsh
Shane Duffy
Kristoffer Ajer
Nir Bitton
Anthony Ralston
Jonjoe Kenny
Ismaila Soro
Callum McGregor
Luca Connell
Ewan Henderson
Ryan Christie
Scott Brown
David Turnbull
Tom Rogic
Mikey Johnston
Mohamed Elyounoussi
Leigh Griffiths
Patryk Klimala
Odsonne Edouard
Albian Ajeti
