Melbourne captain Cameron Smith has used the NRL grand final breakfast to put the heat on Parramatta, declaring his side in better form than any of their previous premiership playoffs.

As both sides sat on stage in front of more than 600 guests at the Sydney Convention Centre on Thursday, Smith took the opportunity to warn the Eels how confident the Storm are heading into their fourth straight decider after big wins over Brisbane and Manly.

"I think it's been building. This is the best form we have been in leading up to any of our grand finals," said Smith.

Eels skipper Nathan Cayless remains in doubt with a hamstring strain but refused to give anything away on Thursday.

He is having physiotherapy four times a day, but won't run until a crucial fitness test on Saturday.

"It's improving," said Cayless.

"(The physio) is giving me every chance to come through the fitness test on Saturday.

"It will all come down to that." The grand final breakfast is the final public engagement for both sides before Sunday's decider.

Melbourne, having been here three times before, appeared the most relaxed as the entire team took off their suit jackets to enjoy themselves.

NRL chief executive David Gallop took the opportunity to congratulate both teams for reaching the decider, thanking them for igniting the season on the field after the difficulties the game has experienced off it.

Gallop said he was most excited about the Billy Slater versus Jarryd Hayne match-up, the game's two best fullbacks.

"It's a promoters' dream and certainly the NRL's dream given the season we have had," said Gallop.

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