Storm Coach Craig Bellamy says practice at training will be the key as his side looks to find combinations to cover injured stars Billy Slater and Cooper Cronk.

Melbourne were stedfast in defence against the Cowboys last weekend, however struggled to build pressure on North Queensland when in possession.

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"It's planning and practice, that's what we need to do," Bellamy said on Tuesday, explaining how his side would improve their attack before facing the Roosters on Sunday at AAMI Park.

"We just plan and try and make it really simple for our halves and make sure we're all on the same page.

"Hopefully we will get some results from that on Sunday."

Bellamy refused to dwell on the absence of Cronk and Slater, saying his side must get on the job and look forward. Melbourne will take on the reigning premiers, Sydney Roosters who enter the contest having recorded back-to-back wins to sit fifth, just points difference outside the top four.

Having Billy Slater and Cooper Cronk out isn't ideal," the coach said.

"Having said that, that's the way it is. That's Origin, that's how the system works. 

"We've got our cards now we've got to play with them."