The 21-year-old was left in considerable pain 19 minutes into the game out in Abu Dhabi on Sunday afternoon having collided with Ezri Konsa after chasing down a loose ball.
Broja was left screaming and clutching his right knee and was carried off after a prolonged stoppage in play.
Speaking after the 1-0 defeat, Potter said it was too early to say how long the player is facing on the sidelines but conceded ‘it doesn’t look positive’.
‘It was an unfortunate action, I think he got caught up with their player and the ground,’ Potter told Chelsea’s official website.
‘It doesn’t look positive at the moment but it is too early to say. Fingers crossed but it is an awkward one.’
The Albania international has made 18 appearances for the Blues this season, starting just two Premier League games.
But his injury will serve as a major blow to Graham Potter’s plans, leaving the manager with Kai Havertz and Pierre-Emerick Aubameyang as his only options through the middle in attack.
Chelsea resume their league campaign against Bournemouth on 27 December.
Reece James and Wesley Fofana meanwhile are continuing their recoveries with Potter hopeful the pair will be available for tha post-Christmas clash with the Cherries.
James suffered a knee injury in October which cost him a place in Gareth Southgate’s England squad.
Fofana, meanwhile, sustained a more serious knee injury against Milan a week prior to James’ setback.
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