Celtic could be without both Scott Brown and Shane Duffy for the visit of Ross County.
Manager Neil Lennon revealed the pair were struggling following Sunday's Scottish Cup Final victory over Hearts.
He rated Brown as a "major doubt", with Duffy a "bit of a doubt".
The Celtic boss promised to make changing after a gruelling weekend test at Hampden went all the way to penalties.
In better news, both Olivier Ntcham and Hatem Abd Elhamed are on the way back following injuries of their own.
Potential Celtic line-up
Provisional squad
Barkas
Bain
Hazard
Frimpong
Elhamed
Jullien
Ajer
Duffy
Ralston
Bitton
Welsh
Taylor
Laxalt
Brown
Soro
McGregor
Henderson
Connell
Ntcham
Turnbull
Christie
Elyounoussi
Rogic
Edouard
Ajeti
Griffiths
Klimala
