St Kilda tall forward Justin Koschitzke says he does not feel slighted by the widespread assumption that Nick Riewoldt holds the key to Saturday's AFL grand final.

Since being drafted at No.2 behind Riewoldt in the 2000 national draft, Koschitzke has played his career in the shadow of the Saints skipper and fellow key target.

That is very much the case this week, with in-form Riewoldt almost universally identified as the Saint who carries his side's hopes of upsetting the Collingwood juggernaut.

But Koschitzke, who has managed just 28 goals in 19 games this season compared to Riewoldt's 37 in 13, said he was content in the role of second fiddle.

"Obviously he's a champion and he's obviously going to have a lot to say in whether we win or lose," Koschitzke said on Friday.

"But that's fine, that's his role and I'll just play my role to the best of my ability."

Koschitzke said he did not feel his own reputation had suffered from sharing the attack with one of the game's greats.

"Absolutely not, I feel blessed to be able to play in an era with a once-in-a-generation champion," he said.

"So I never feel any sort of animosity towards him at all, I just honestly feel blessed to play alongside him."

Koschitzke and Riewoldt both struggled in wet conditions in last year's grand final against Geelong, managing just two goals and nine marks between them.

While the forecast is more favourable for marking players this Saturday, Koschitzke said the Saints did not care what conditions eventuated.

"The wet didn't faze me last year, I think we just had the faith in the ability of all the guys, it turned out to be a wet day and it wasn't our day in the end, but it was very close to being," he said.

"I don't think the conditions come into account, it's just all about us working harder on the day."

The big forward also dismissed suggestions he might be a late pre-game withdrawal, after reports he broke his ribs in a collision in last Saturday night's preliminary final win over the Western Bulldogs.

"I'm not really sure where it's come from, I guarantee they're not (broken) ... I'm ready to roll, no dramas at all."

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