We take a look at four big factors going into Sunday's game against the Saints...

Us…

Two changes for the Power sees Jasper Pittard make his return from an ankle injury, along with the in-form Sam Gray.

Angus Monfries and Jarman Impey are out of the side. 

FINAL TEAM: Pittard returns

And them…

St Kilda has replaced the injured Sam Gilbert and rested Riewoldt and Lonie with ruck-forward Tom Hickey, 19-year-old Daniel McKenzie and ex-Sydney player Tim Membrey.

McKenzie and Membrey have been form players for St Kilda's VFL affiliate Sandringham. 

Hickey and Membrey will form a different-looking forward line for the Saints, with both set to start in the pockets for Sunday's game.

THREE SAINTS TO WATCH 

What we loved last week

The Power is going to win games by griding its opposition down, it did that in part against Essendon last week.

Few could argue against the significant impact of Paddy Ryder in the final term, though - his three last quarter goals went a long way to securing the win. Lucky for Port.

IN NUMBERS: The Power and Saints rivalry

What we didn’t…

Port still lacks a killer instinct. Essendon got on significant goal runs, particularly in the third term.

Leaking goals has been a painful habit of Port's this year.

PREVIEW: Power v Bombers

Red flag

St Kilda is without three first-choice players in Riewoldt, Gilbert and Lonie, but that doesn't necessarily make the Power's task any easier.

With Richmond knocking off Hawthorn, Melbourne beating Collingwood and the Suns forcing a tie with West Coast, the form guide has clearly been mashed up, burned and thrown out the window this weekend.

Port cannot let its guard down.

FAN FACTOR: How the crowd affects Port's wins

Watch out for...

Pittard from the half-back. No one wants to miss a fortnight due to a training injury. He'll be hungry to get back into it.

GAME DAY: Ultimate guide to Round 18