Tom Rogic drops out of the Celtic team for their cinch Premiership encounter with Livingston with a hamstring injury that will sideline the midfielder for two or three weeks.
But Josip Juranovic has overcome an eye injury that resulted in him visiting hospital after Wednesday's win over Hibernian.
Christopher Jullien and James Forrest are just short of comebacks, while Greg Taylor (shoulder) and Karamoko Dembele (ankle) remain on the sidelines after surgery.
Ange Postecoglou is convinced he has options in the absence of the Wizard of Oz.
He said: “Cal [ McGregor ] has played there before, Jota has the capabilities and we have a couple more options.
“Short-term, I think we can find solutions there."
Livingston have key attacker Andrew Shinnie back in contention after he missed the last three games with an ankle injury, while Jackson Longridge is also set to be available after a two-game absence through injury.
Stephane Omeonga returns after missing Wednesday's 1-1 draw against Dundee United due to a head knock, but Ben Williamson is suspended following his red card in midweek.
James Penrice (hernia) and Adam Lewis (foot) remain out, while goalkeeper Daniel Barden is undergoing cancer treatment.
Predicted Celtic XI
Provisional Celtic squad
Hart
Barkas
Bain
Hazard
Ralston
Juranovic
Starfelt
Carter-Vickers
Welsh
Bitton
Montgomery
McGregor
Soro
McCarthy
Turnbull
Henderson
Jota
Forrest
Johnston
Abada
.jpg?w=600)
