Port Adelaide acting captain Zak Butters has had his charge upheld by the AFL Tribunal.

The AFL has ordered Butters pay a $1500 fine for "using abusive and insulting language towards an umpire" during Sunday's game against St Kilda.

Senior player Ollie Wines and GM of Football Ben Rutten both gave evidence during the hearing, backing up Butters' position that he did not make the comments alleged by umpire Nick Foot.

"The club is deeply disappointed in the Tribunal's verdict and rejects any suggestion that questions Zak's integrity," Port Adelaide chief executive Matthew Richardson said.

"Zak is a man of outstanding character and we are acutely aware of the toll these proceedings take, not only for him but for his family and those closest to him."

Port Adelaide stands unequivocally with Butters and will await receipt from the AFL of the formal Tribunal findings Wednesday morning before considering grounds for an appeal.