Brendan Rodgers has expressed frustration with the situation that could see him without up to eight first-team players for the trip to Ibrox to face Rangers on September 3.
Centre-halves Cameron Carter-Vickers, Stephen Welsh, Maik Nawrocki and Yuki Kobayashi are all doubtful due to injury while Rodgers is also currently without Reo Hatate, Oh Hyeun-gyu, Mikey Johnston and Marco Tilio.
The return of Alistair Johnston to full training has come as a welcome boost with the right-back lined up to make his comeback against St Johnstone on Saturday after recovering from ankle surgery.
But with only two fit senior centre-backs in the shape of new signing Gustaf Lagerbielke and out-of-favour Liam Scales, Rodgers will be forced into fielding a makeshift defence for upcoming matches.
"It's very frustrating,” the Northern Irishman told Celtic TV. “Obviously, you want to have your best players available and clearly that's not the case for us. But you have to get on with it. It's just been the nature over the course of pre-season. We just have to deal with it, we've got lots of capable players in the squad and I'm sure they will step up."