The NRL is set to deny thousands of fans the opportunity to watch next weekend's NRL preliminary final between Wests Tigers and St George Illawarra after refusing to switch the Aussie Stadium clash to the much larger Telstra Stadium.

The Tigers clinched a spot in the last four with a 34-6 win over Brisbane in front of more than 36,000 fans at Aussie Stadium.

But the NRL said there was no way it would take Saturday night's clash with the Dragons, which could potentially draw double that figure, to the 80,000-capacity Telstra Stadium.

Parramatta will play North Queensland at the Olympic venue on Sunday afternoon, a match better suited to the smaller confines of the 40,000-capacity Aussie Stadium.

NRL media manager John Brady said it would be logistically impossible to switch the venues for the two clashes, with thousand of tickets already pre-sold.

"There's no way that you can take the games from one to the other," Brady said.

"You've already got people that have bought tickets to those venues, you've got members, you've got corporate boxes. It's just not possible."

Only 12,000 tickets remain for the Tigers-Dragons grand final qualifier, 2000 of which have been reserved for Tigers season-ticket holders.

The Tigers will enter the match as underdogs, but they found an unlikely ally in Broncos captain Darren Lockyer, who said the Dragons could struggle given they have only played two matches in the last four weeks.

"I think the Tigers might have a small advantage next week because St George haven't played a lot of football," Lockyer said.

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