NRL chief executive David Gallop has written an open letter to Wests Tigers fans, apologising for not being able to change venues for Saturday's grand final qualifier against St George Illawarra.

Tigers fans had hoped to have their much hyped preliminary final against the Dragons to be switched from the 41,000-capacity Aussie Stadium to Telstra Stadium which holds 82,000.

Tigers supporters made up the majority of the 36,000-plus fans who packed Aussie Stadium on Sunday to witness the joint venture's 34-6 semi-final victory over Brisbane.

Even NSW premier Morris Iemma, a Dragons supporter, expressed his disappointment that the NRL wasn't switching the final to Telstra Stadium.

"I'd hope that the NRL and the trust can get together and get this game at Homebush," he said.

However, Gallop confirmed that a venue switch was "impossible" but agreed that "there is a need to look at future (venue) contracts to gain more flexibility".

"At the outset let me say that I understand your disappointment with the fact that we were not able to move the match between the Wests Tigers and St George Illawarra to Telstra Stadium," Gallop wrote.

"It was an issue that we actively explored in the lead-up to and immediately after Sunday's game.

"Given the contract we have in place and the fact that around 50,000 tickets had been issued across both Telstra and Aussie Stadiums by full-time, it was simply impossible.

"We have already agreed that there is a need to look at future contracts to gain more flexibility."

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