Port Adelaide midfielderย Karl Amon will miss up to one month of football after scans revealed a fractured patella.

Amon suffered the injury against Geelong in round 10 when he took a knock to his knee, although scans revealed the injury was worse than first thought.

The 21-year-old was a late withdraw against Hawthorn last Thursday night, and was replaced in Port Adelaide's side by Jimmy Toumpas.

โ€œWe felt it was a minor knock originally, but when he couldnโ€™t come up for the match against Hawthorn we decided to get it scanned,โ€ Port Adelaide head of high performance Darren Burgess told the club's website.

โ€œThe scans showed a fracture there, unfortunately it looks like a 3-4 weeker for him.โ€

Amon's injury looks to be the only major injury concern for the Power, as Chad Wingard, Dan Houston and Cam Hewett are all set to undergo fitness tests during the week.