He's already been ruled out of the Socceroos' crucial World Cup qualifiers, but Celtics midfielder Tom Rogic is also set to miss the Old Firm derby against Rangers as well.
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Rogic injured his ankle on the weekend, forcing him to miss the Socceroos' clashes against Japan, played in Sydney on Thursday night, and Saudi Arabia next week.
Australia needed to win both of those to have any chance of automatic qualification for the next World Cup.
Rogic remained in Glasgow and didn't travel Down Under to join the Socceroos squad.
Celtic manager Ange Postecoglou said Rogic would be ruled out in the "medium-term", putting him in doubt to for Celtic's next game - against rivals Rangers at Ibrox Stadium on April 3.
Postecoglou said Rogic was lucky the injury wasn't much worse after he came off second best from a tackle from Ross County defender Kayne Ramsay.
"We'll see how it all transpires," Postecoglou told Celtic TV.
"Unfortunately he couldn't go back and represent his country which was disappointing for him. He's still sore.
"He probably won't train this week and we'll just assess how he goes in the week leading up to the next game.
"But suffice to say he was pretty sore after it. He probably could've been a helluva lot worse, but at the same time it's enough to keep him out for the medium-term."