The prop was part of the Boiled Lollies team who almost upset their undefeated crosstown rivals in the 2016 decider.

This time around he's part of the unbeaten side looking for premiership glory.

He believes that result, and a close win over Waratahs in their last clash, provide valuable lessons heading into the decider at Conolly Rugby Complex on Saturday.

"It's nice being undefeated don't get me wrong but we know we have a big challenge ahead of us," Seymour said.

"Tahs are back-to-back SIRU premiership winners for a reason so are not taking that lightly.

"If we take it lightly we are going to get beaten so we've been focused on the actual game not the occasion or the moment."

It would be a massive occasion for the club, who are hunting their first top tier premiership since 1976.

Seymour has taken on the captaincy role full-time this season.

He's been handed the role for periods in the past, but has enjoyed the extra responsibility handed to him by Ben Schreiber this season.

"Having eight or nine guys we've had for the past three years behind is like having 10 captains at once but just my voice is the critical one at the end of the day," Seymour said.

"It's been good fun."

The Englishman is in his sixth season with the club.

He's been through plenty of ups and downs during his team but is confident they've got the balance right this time around.

"We've pretty much had the same tight five for the last four years and have a core group of young guys who have come through juniors at Wagga City with all the ups and downs," Seymour said.

"Having that core group of nine or 10 players and then the X factors with the Herangi brothers and Noa Rabici and Jimmy Olds have just added to our game."

Seymour admitted Waratahs caught the team off guard in their last encounter earlier this month.

After charging out to an early lead, following two heavy defeats earlier in the season, Waratahs led for the majority of the clash before Steven Tracey scored on the last play of the game.

He's determined not to let that happen again in the biggest game of the year.

"The first two times we played them, when we put 40 on them, it drove them a little bit to perform," Seymour said.

"They definitely caught us off guard in that first half and having a closer game shows they've been building throughout the year and are not going to let us take this year lightly."

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