Kieran Tierney is a doubt heading into Sunday’s Old Firm derby after suffering a foot injury against Aberdeen.
The Scotland international, who has two goals in his last two games, suffered a knock during Celtic’s 2-1 victory at Pittodrie on Wednesday night.
Tierney went down under a challenge from Aberdeen’s Toyosi Olusanya and was forced off.
The 28-year-old missed training at Lennoxtown on Friday ahead of the Scottish Cup quarter-final clash at Ibrox.
Meanwhile, Hoops goalkeeper Kasper Schmeichel was back in training on Friday after being replaced for the last two games by Viljami Sinisalo.
O’Neill said he will wait and see how the left-back is on Saturday, with a similar situation surrounding Schmeichel following an injection.
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