Celtic manager Brendan Rodgers continues to wait on the full extent of Daniel Arzani's injury, but fears that the Caltex Socceroos star may have injured his cruciate ligaments.
The 19-year-old made his debut as a 56th-minute substitute in the Hoops' midweek 5-0 win at Dundee United, but was stretchered off just 20 minutes later after twisting awkwardly.
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The Scottish Premiership outfit are yet to make a full prognosis on the injuries suffered by Arzani, who arrived on a two-year loan deal from Manchester City, and Eboue Kouassi, but Rodgers provided this update.
"We are waiting on the final analysis of the scans but it is unfortunate. It looks like we will have two cruciate injuries," he said.
"If it is the case it will rule them both out for the rest of the season.
"It's hugely disappointing for both boys because they have been on the sidelines working their way through and in the last week they have been given opportunities, and both are innocuous really.
"One a landing and two, Daniel's was a twist where his studs stayed in the grass and twisted his knee.
"We'll assess what's best for Daniel. He still has to go through the final part of his scan at the beginning of next week hopefully and then there will be a plan put in place for him."