Vasilis Barkas faces a sweat to be fit for the crucial showdown with FC Midtjylland, while Mikey Johnston limped off with what looked like a hamstring injury against Bristol City.
The Parkhead club face their first Champions League qualifier on Tuesday as they look to return to the group stage for the first time since the days of Brendan Rodgers.
Star striker Odsonne Edouard went off injured against Charlton, leaving manager Ange Postecoglou with a sweat for his first competitive match.
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