West Coast insist they don't feel they've over-achieved this AFL season and they're hungry for another premiership.

Ahead of their preliminary final against Geelong at the MCG on Saturday, senior assistant coach Peter Sumich dismissed the suggestion that the Eagles, who won the wooden spoon last season, might be vulnerable.

"I don't believe in that, I believe our blokes are mentally strong and really looking forward to the contest," said Sumich.

"They're mentally strong ... we have a great energy."

Sumich said the Eagles can beat the highly-favoured Cats because they're a "good, balanced side".

"Our backs are in form, our forwards are going okay and we've got a solid midfield.

"It all stacks up."

Sumich said midfielder Matt Rosa would be up to the challenge if he was needed, despite not playing for the past six weeks with a knee injury.

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