FREMANTLE star Ebony Antonio has injured her right knee in Saturday's practice match against West Coast. 

Late in the opening quarter, the veteran smothered an Eagles kick out of defence close to the boundary and landed awkwardly on her right knee in the process. 

Antonio grabbed at her knee immediately and punched the ground, before being helped from the field. 

The utility was Fremantle's equal-leading goalkicker last season with 10, and has become known for her fancy footwork in attack.