'Dubbed a liar': Port to appeal Butters verdict

Port Adelaide's Zak Butters is angered at being found guilty of umpire abuse by the AFL Tribunal. (Matt Turner/AAP PHOTOS)

Seething Port Adelaide believe Zak Butters has been branded a liar and will appeal the AFL Tribunal's finding that the star midfielder abused an umpire.

As the AFL Players' Association expresses concern at the tribunal not believing Butters' testimony, Port say they will take the controversial case to the appeals board.