South Sydney's Roy Asotasi says Melbourne's recent stumbles have served as a warning to the Rabbitohs about the importance of having the right attitude each week.

The NRL leading Rabbitohs face last-placed Wests Tigers at ANZ Stadium on Friday night.

Souths went to the top of the league last weekend after they dispatched North Queensland while premiers Melbourne fell to battling Penrith.

It was the Storm's second consecutive loss after going down to Canberra.

Asotasi says the Storm's defeats highlight the need for teams to turn up with the right mindset, no matter who they were up against.

"We could drop a game this Friday night and the following week and then we're back where we don't want to be," Asotasi said.

"But we understand Melbourne are still the benchmark side. It comes down to whether you want to turn up to play. It's all about attitude.

"That's something that we need to work on because we've struggled with our last couple of starts."

The New Zealand international insists the Tigers have plenty going for them and singled out prop Aaron Woods and fellow Kiwi Adam Blair as players to watch.

"Aaron Woods is playing some good football. He'll be looking to stake his claims for Origin," he said.

"Then you've also got Adam Blair. He's copped a bit of a blasting through the week and he's looking to prove a point."

Tigers coach Mick Potter has dumped star Benji Marshall to the bench and will field a monster halves pairing of Curtis Sironen at halfback and Liam Fulton at five-eighth.