Disunity isn't the cause of Port Adelaide's disheartening AFL season, according to captain Dom Cassisi.

He has scotched speculation of a rift between coach Mark Williams and chief executive Mark Haysman as a factor in the Power's failures.

"As a captain I've spent time with both of them and they get along great," Cassisi told reporters on Monday.

He also dismissed rumours of a split in the player ranks at Alberton, declaring his teammates were united.

Port will likely miss the AFL finals for consecutive seasons, after many pre-season pundits talked up their premiership credentials.

They can only make the finals if Hawthorn defeat Essendon and the Power then thrash North Melbourne by around 100 points on Saturday night.

Despite the bleak prognosis, Cassisi maintained Williams was the right man to lead Port from the mire.

"We understand people are frustrated, supporters are and we are, and the main thing is we've got to stick together and keep working," he said.

"Choco (Williams) is definitely the man for the job and we're definitely behind him.

"We're all disappointed with our year ... we're all working really hard as a team to improve and we haven't been able to do that, so that's where the frustration lies."

But Cassisi warned players who haven't improved were "at risk".

"Like any other team, if you've been on the list for a few years and you haven't shown particular improvement, then your spot on the list is definitely at risk" he said.

"But that's for the coaches to decide.

"Every year there are changes to every team's list and no doubt that is going to happen here."

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