For weeks they have glared warily at each other like a couple of ex-mates in a pub, waiting to see who will make the first move.

It's a scenario that Group 7 heavyweights Warilla and Gerringong know only too well.

When you've squared off in three of the past four grand finals, you tend to keep an eye on what the other is doing.

Last season, Gerringong came from behind to beat Warilla 14-13 in extra time, a grand-final loss that still haunts the Gorillas.

On Sunday they will meet for the first time since the 2013 premiership decider.

"We definitely have a history of close games with them, and we're not expecting anything different," Lions coach Mick Cronin said.

Gerringong are fifth with three wins and two losses, though they have a washed out game in hand.

The Gorillas have been unstoppable in 2014, winning all six games.

"They're undefeated and they're the benchmark side at the moment," Cronin said.

"They've probably improved on last year with (Damien) Paulissen and (Nick) Lazeresvki back, so they definitely haven't gone backwards.

"We have to start doing some improving [too]."

Gerringong won three straight games by big margins before the run was halted by a 17-10 loss to Kiama.

"We had no complaints or excuses," Cronin said.

"They defended well. There wasn't a lot in the game but they played better than we did.

"We got into a tough game against Kiama and things that had worked in those other games didn't come off. They exposed a few deficiencies and we just have to work on that."

Cronin said Kiama's form had been good.

Improving Nowra-Bomaderry will be confident of chalking up a third consecutive win in their home clash with Albion Park-Oak Flats, while Shellharbour should be too strong for Port Kembla.

Berry-Shoalhaven Heads will be fired up to spring an upset over fourth-placed Jamberoo on Saturday at Kevin Walsh Oval.

The Superoos thrashed Albion Park-Oak Flats in their last match, while Berry lost to Shellharbour.