Craig Bellamy says the Club will continue to take a cautious approach with the fitness of its Origin stars.

Just five days after a hard-hitting, gruelling Game II, Storm with go head-to-head with the Sydney Roosters.

Despite both sides being locked on 20 Premiership points and the result likely to shape the run home, Melbourne will not be pressured into selecting their representative players should they not be fully fit.

"There are a few of them with bumps and bruises," Bellamy said.

"I'm pretty sure most of them will play on Friday night but some of them might not.

"They will need treatment and hopefully after that they will be okay. We will take an extended squad with us to Adelaide, we will train over there as well so we will check on them on Friday and go from there."

The wait will go on at least a few more days as to whether Billy Slater makes his return to the Storm line up.

A hamstring injury and Origin commitments mean it has been six weeks since the 35-year-old has played for Melbourne.

Although he seemed to be moving at his electrifying best once again on Sunday night, the coaching and medical staff will undertake a risk assessment before determining if he runs out onto the Adelaide Oval.

"He played a strong 80 minutes but his first 20 or 30 were outstanding," Bellamy said.

"He seemed to have pulled up okay, especially after a hamstring injury but it is not long after the game either.

"We have been on the conservative side with him so we will stay on that if we have to but if he can play through the 80 minutes we will play him."