ADAM Simpson insists West Coast has moved on from the euphoria of last week's epic after-the-siren elimination final victory, and is up for the challenge of defying consecutive weeks of travel against Greater Western Sydney on Saturday night.

The Eagles travelling party of 26 flew out from Perth on Thursday afternoon without Nic Naitanui, after a week of speculation the star ruckman might make a fairytale return.

Simpson hinted West Coast could retain an unchanged line-up for a third-straight match.

The West Coast coach is backing his ageing line-up to cross the Nullarbor for the third time in seven days and be ready for a nimble Giants side set to try to run the Eagles off their legs.

"We've got no choice, that's what we've got to have a go at," Simpson said.

"We put ourselves in the position finishing eighth that we knew this was going to the challenge.

"The feeling I've got is the players are up for it.

"If we bring the right attitude with that, what will be will be, but we're going to give it a crack.

"It's not a bad thing that we're getting on a plane today as well.

"It was a big game last week. It was an emotional game and might be one of the greatest games I've been involved with.

"But we've still got a job to do.

"We have moved on."

Simpson played ducks and drakes on Thursday morning when he refused to rule Naitanui in or out of the clash.

But Sharrod Wellingham, Will Schofield, Chris Masten and Malcolm Karpany were the four players added to the 22 that overcame Port Adelaide in the elimination final.

Simpson said it was tough weighing up the temptation of bringing in fresh legs against continuing with the same team which has defied the underdogs tag against Adelaide and the Power.

"It has been difficult to get that right, because looking at all our players they are in pretty good health, and leveraging off the energy and the enthusiasm of the game we have just played is really important," he said.

"But we also can't float through the week and expect that we won't have sore players after 140 minutes of football.

"They have all pulled up pretty well and we won't be making too many changes."

The Eagles have lost both matches to GWS this year, including a 21-point defeat at Spotless Stadium in round 22 when they were in the contest late.

"Weight of numbers in the end hurt us, which wasn't the first time for the year," Simpson said.

"We're just going to have to play four quarters."

Giants star Josh Kelly looms as the dangerman after racking up 43 touches and booting a goal last time the teams met, when West Coast instead decided to tag Dylan Shiel.

Mark Hutchings wasn't sent for a run-with role against the Power, and Simpson is weighing up the value of tagging one player in the Giants' gun midfield brigade.

"Obviously Kelly had mid-40s in terms of possessions last time we played and we kept Shiel pretty quiet, so the balance of that as opposed to what's best for a win is what we're working through," Simpson said.

"When they're up and about they're pretty even with what they can produce, so stopping one sometimes doesn't work."