Port Adelaide chairman David Koch will not stand for another year of mediocrity, and says changes will be made at the end of the season should the Power miss the top eight.

"It (not making the finals) is just fail, full stop," Koch told Channel Nine on Thursday night.

"I hate giving excuses.

"I'll just say 'we've failed, we've learnt, we've got to do better, and we'll continue to learn'."

After making a preliminary final in 2014, Port Adelaide have failed to back up that performance and have missed the finals for the past two seasons, with coach Ken Hinkley now firmly in the firing line.

When asked whether he'll be able to cope with another year of failure without making changes to the club, Koch simply stated: "No. We won't.

"We understand the expectations of our members and supporters, and my expectation is that we play finals each and every year, and high finals.

"We're not going to tolerate a third year (of failure) at all. We don't think we'll need to."