The Kooris, who have won two straight third grade premierships, will look to become just the third team in the competition's history to achieve a three-peat.

Crookhaven were the first to do so from 1988-1990, before Jamberoo matched their accomplishment between 1992-1994.

"I have complete confidence the boys will get the job done on Sunday," Kooris coach Russell Roger Henry said.

"Even if we get behind in a game, the boys trust each other's abilities to get us out of any hole - that's a sign of a good side."

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Throughout the season, the Kooris, who are assistant cached by Nathan Austin won 11 of their 18 matches, to finish the season in second - behind minor premiers Wreck Bay, who were sent packing by Sussex Inlet on Sunday.

"During the season, I kept telling the boys, these little games don't mean as much but as long as we are building, we will be right to produce in the big games - which we have done," Henry, who was shortlisted for Country Rugby League's Volunteer of the Year, said.

"These boys just step up when it counts and I couldn't be prouder of their improvements over the past three years."

Standing in the way of the Kooris' three-peat are Sussex Inlet, who have won their past four games - setting up a replay of the 2017 decider.

"I don't think many points will be scored on Sunday, meaning our strong forwards will need to win the battle in the middle of the park," Henry said.

"If they do that, it'll allow our dangerous backs to get on the attack and ask questions of their defence."

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If they do in fact win this match on Sunday, Russell admits it'll be a just reward for his troops' commitment, on and off the field.

"All the boys are great mates, which makes the fact we've been successful that little bit more special," he said.

"There's no doubt they'll be fired up on Sunday to prove just how talented this group is - we can't wait."

Kick-off is at 11.15am.