Dan Toal is struggling to face Leigh Centurions due to a dead leg, while Craig Briscoe and Joe Bullock are both unavailable.
Murray said: “Leigh are probably tipped to be in the top three or four, if not at the top, but we’ve got to raise our game and meet that challenge head on.
“We’ve got home advantage and we’ve got to get amongst them and see what we can do.
“Our commitment and enthusiasm was never in question (last week), but we picked a few wrong options. That’s something we need to change on Sunday.”
Leigh coach Paul Rowley will pick from a fully fit squad as he aims to back up a 52-12 win over Batley Bulldogs with another convincing display.
Rowley said: “Everyone was casting an eye across the league to see how everyone started, and I’m sure that result raised a few eyebrows. Now and again you get days where everything goes for you.
“We’re obviously happy, but our feet are on the floor. We know it’s a tough year ahead and we’ll need to be even better to achieve our goals.”