VIPERS coach Heath Sangster believes Wests Titans are his sides' main title threat if they can make the top-four.
Runners-up in 2013, the Vipers' are two points clear at the top of the competition having only dropped points this campaign via a forfeit.
Sangster is adamant Wests are their biggest danger to lift the silverware.
"I think Wests can't be wiped out. They are a very consistent team who have been playing together for some time," Sangster said.
"They can really pull together come finals so I wouldn't be surprised to see if Wests knock off second and third."
The Titans are in a battle with Corrimal RSL Cadets to make it into the Premier League finals with two matches remaining.
RSL lead Wests by one win on the ladder but the virtually unbeaten Vipers are scheduled to play Cadets this weekend.
"They are a nice little side who are finally stringing things together," Sangster said.
"They seem to have three good quarters and then one fall-apart-quarter and if they make the top-four they will need to get their act together to play all four quarters.
"That is what loses it for them."
A win this weekend would virtually sew up the minor premiership for Vipers, who have already secured their finals spot. Sangster said his side would keep their focus on their execution on the final two rounds.
"We are just going to get our consistency down pat for the finals.
"Getting those turnovers and converting our goals."
Vipers continued their strong form last week with a 45-34 win over finals bound Brindles. In other matches, Dapto Storm upset Cadets 43-42, SMJ downed Woonona WBRSL 58-40 and Wests defeated Woonona McDonald's 47-18.