PORT ADELAIDE coach Mark Williams says his team is keen to reassert its dominance over Adelaide with a win in Sunday's Showdown.

The Power, who won the inaugural meeting between the SA rivals, won seven straight encounters between 2000 and 2003 but the Crows have rallied under coach Neil Craig to claim six of the last seven.

The ledger is now square and Williams said his team would be out to restore Port Adelaide’s place as the top dog in town.

"The ledger is 12-12 now, they’ve caught up to us, we want to keep our noses in front and it’s pretty important for us to win," Williams said at the Balfours Showdown press conference on Wednesday.

"We’ve been in that position [ahead of Adelaide] ever since we came into the competition and right now it’s 50-50 and we’d like to sneak our way ahead again.

"Finishing the season on a good note is important for us, but also when it comes to big games for us and big crowds, it’s always playing the Crows and we really look forward to it.

"When you come in against a team that is about to play in the finals, they are going to try as hard as possible to maintain their opportunity and we’re going to try just as hard to beat them."

On Monday, defender Troy Chaplin labelled Sunday’s grudge match as Port Adelaide’s grand final and his coach agreed.

"Every game is a game worth four points, but against our traditional rivals in front of what will probably be our biggest crowd for the rest of the season, if you add those things together it makes it that sort of [grand final] status," he said.

"Hopefully, it’s a different result to the grand final of last year."

The Power enjoyed a solid main session at AAMI Stadium on Wednesday ahead of what’s expected to be another physical encounter.

Michael Wilson, who is considered a chance to resume this week, was restricted to light duties along with fellow defender Jacob Surjan and ruckman Dean Brogan.

Port Adelaide was fierce in its attack on Adelaide in round three and Williams suggested fans could expect more of the same this week.

"I think since Balfours jumped on board at the start of this year we’ve had one of the best-ever Showdowns," he said.

"We would argue we played pretty hard and tough and we smashed and bashed in a brilliant game, and I’m sure the Crows are really proud of that win. They probably finished with 16 fit players and they won.

"Everyone walked away from that game thinking it was right up there with one of the best football games, and to be salivating for the last however many weeks it’s been – thinking 'We can’t wait for the next time that game comes around'.

"I’m thinking it will be sold out by Sunday."