Toiling Kris Ajer is a major doubt for Celtic's rearranged Scottish Cup semi-final against Aberdeen at Hampden Park on Sunday
The Norway international hobbled off with a groin strain in the 2-2 Europa League draw with Lille in France on Thursday night.
Defender Hatem Elhamed returns to the squad after self-isolating due to contracting Covid-19, while James Forrest (ankle) and Christopher Jullien (back) remain out for Celtic.
Aberdeen 's Dylan McGeouch is out of the clash with a groin problem which sees him sidelined for two months.
Ryan Edmondson (concussion) and Marley Watkins (hamstring) should be fit.
Mikey Devlin, Matty Kennedy, Greg Leigh and Curtis Main are all getting their fitness levels up after recovering from various injuries.
Potential Celtic line-up
Provisional Celtic squad
Vasilis Barkas
Scott Bain
Conor Hazard
Shane Duffy
Nir Bitton
Hatem Elhamed
Kris Ajer
Greg Taylor
Jermie Frimpong
Stephen Welsh
Diego Laxalt
Scott Brown
Ismaila Soro
Tom Rogic
Olivier Ntcham
Callum McGregor
Leigh Griffiths
Albian Ajeti
Patryk Klimala
David Turnbull
Ryan Christie
Moi Elyounoussi
Odsonne Edouard
