FREMANTLE will be without Gabby O'Sullivan for its clash against St Kilda on Friday after her one-match ban for striking was upheld at the Tribunal.

O'Sullivan was charged with striking Melbourne's Sinead Goldrick during the Dockers' thrilling six-point win over the Demons on Saturday.

The Match Review Officer graded the incident as intentional conduct, low impact and high contact, leading to the one-match ban.

The Dockers argued O'Sullivan's action should be considered careless, not intentional, in their bid to downgrade the charge to a fine.

But they were unsuccessful, meaning they will be without O'Sullivan for the clash with the Saints at RSEA Park.

The Dockers are 3-1 and sit inside the top eight.