Scans showed that Farah suffered a fracture in the match against the Bulldogs and now faces an anxious wait on more tests.
“An x-ray this morning showed Farah has a fracture,” read a club statement.
“He then underwent a CT scan with the Club expecting the results on Monday. Farah may see a specialist subject to the results of the CT scan.”
The Tigers went down 23-22 courtesy of a golden point field goal kicked by Bulldogs centre Krisnan Inu, but both coach Tim Sheens and Farah were incensed by several refereeing decisions.
Farah was denied a try by referee Jared Maxwell while Canterbury benefited from a contentious decision from video referee Sean Hampstead to award Bulldogs winger Jonathan Wright a late score.
The result means the Tigers must beat the Roosters and Melbourne to qualify for the finals.