Duncan is expected to miss up to two months on the sidelines as he recovers from the injury he sustained in the first quarter against the Bulldogs.
On Sunday, Geelong's general manager of football Simon Lloyd confirmed there was no other damage to Duncan's knee.
This is the incident that saw Cats star Mitch Duncan hurt his knee, forcing him to be subbed out.
— Fox Footy (@FOXFOOTY) June 18, 2021
“We were expecting that the injury was to Mitch’s PCL, and the scan confirmed that,” Lloyd told the club's website.
“There was no other damage to Mitch’s knee. The rehabilitation timelines will be further discussed with our medical and fitness team in consultation with specialists.
“We will explore all available options that will allow Mitch to return as quickly and safely as possible.”
If all goes to plan Duncan can expect a return before the start of the finals.
The 30-year-old had been one of Geelong's most consistent performers this season, averaging 26 disposals and 7.9 score involvements in 10 games.
Fortunately, the Cat's have already proved this season that they can fill the void left by an injury to a star onballer when they were without Patrick Dangerfield for seven weeks.