Port Adelaide coach Mark Williams has implored his players to find inspiration from a tour of an Australian warship on the eve of their Anzac weekend clash with St Kilda.

Power players and Williams on Friday toured HMAS Arunta, whose motto is Conquer or Die.

"Their motto of Conquer or Die really works for us when it comes into the game," Williams said.

"I was never aware of the motto before, but the fact is a lot of the sailors are the same age as my players and for them to experience what other people are doing at the same age, I think, is important.

"There are so many things - it's about discipline, it's about order, it's about command, it's about listening, all of those things are what the armed forces and navy are built on."

Williams' charges host St Kilda at AAMI Stadium on Saturday night having lost their past two matches.

The Power coach has bolstered his rucking ranks with first-gamer Matthew Lobbe, who will support top tapman Dean Brogan against the Saints' hardened ruck combination of Steven King and Michael Gardiner.

"For Matthew Lobbe to be there and, against the odds, having a crack at it ... Gardiner and King are great ruckman and Matty Lobbe couldn't get a bigger contest and a bigger opportunity to show what he can do," Williams said.

Lobbe replaced fellow novice ruckman Jackson Trengove, while Daniel Stewart has been dropped after making his AFL debut in Port's 95-point loss to Geelong last weekend.

The Power also could not consider Nathan Krakouer (groin) and Cameron Hitchcock (back), with Jay Schulz, Paul Stewart and Hamish Hartlett summoned as replacements.

St Kilda has welcomed back Justin Koschitzke from suspension to replace the injured Jason Gram, with Williams adamant the Saints are not suspect with their skipper Nick Riewoldt sidelined by a serious hamstring injury.

"It's a huge challenge, you look forward to these opportunities," Williams said, acclaiming St Kilda's pressure on their opponents as the best in the competition.

"If you want to be a top four side, you need to be able to handle that sort of pressure and dish some out yourself.

"We keep watching it and looking at it and trying to learn from it and, in time, we will."

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