After being stretchered from the pitch in his debut for Celtic, Daniel Arzani could be set to spend up to a year on the sidelines with early reports suggesting he may have torn his anterior cruciate ligament.
The 19-year-old lasted just over 20 minutes against Dundee as a substitute before going to ground having twisted his knee awkwardly.
Arzani appeared to be in visible discomfort before being stretchered from the field and leaving the Hoops to finish the game with 10 men.
Initial signs did seem positive with the Australian waving to the crowd as he departed the pitch and Brendan Rodgers saying the injury didn't look 'so bad' post-game.
Arzani will undergo scans tomorrow to confirm the diagnosis and is now a major doubt for the Socceroos Asian Cup defence in January.
Prior to his tragic injury blow, the Aussie teenager was impressing the Hoops faithful and earned praise from Rodgers after the match for his attitude.