ADELAIDE has failed in its bid to overturn David Mackay's one-match ban at the Tribunal on Thursday night.

Mackay was charged with making forceful front-on contract on Matt de Boer during Tuesday night's clash.

>> WATCH THE INCIDENT IN THE PLAYER ABOVE

The incident was assessed as careless conduct, medium impact and high contact.

The Crows tried to argue that he had no realistic alternative and it was low impact, rather than medium.

They also tried to use the veteran's exemplary record of never being reported in his 14-year career, but the suspension was upheld