The Sydney Roosters squad have been assessed by Club medical staff following Sunday's NRL Grand Final against the Canberra Raiders.
Mitchell Aubusson was taken from the field in the early stages of the first half and was unable to return to the field.
Scans on Tuesday confirmed that he sustained a moderate medial ligament injury.
He will be monitored by the medical staff and undergo a rehabilitation program in the off season.
There were no other injury concerns to come from the match.