Geelong are hopeful that Cameron won't be too hampered by the injury, with the home and away season kicking off on March 20 for the Cats against Adelaide.
The setback comes as a blow to Cameron who is coming into Geelong on big money after a sub-par 2020 campaign.
Cameron has suffered from soft-tissue injuries in the past, having missed the 2017 finals due to hamstring issues.
Cameron spoke about his desire to get back to his Coleman Medal winning form when speaking to reports last year.
“I want to have my best season I’ve ever had,” Cameron said in December.
“I don’t want to set low goals. I want to set a really high standard and train really hard over the summer and I’ve already started that probably about six weeks ago.”