Celtic boss Ange Postecoglou admits striker Giorgos Giakoumakis is a "50-50" shot to make it for Wednesday's crunch clash with St Mirren.
The Greek striker netted a hat-trick against Dundee but was absent for the clash with Hibs due to an illness.
And his eye for goal was badly missed as his side stumbled to a toothless 0-0 stalemate in his absence.