Cronulla officials are concerned the back injury sustained by Ben Ross is not improving with the former Queensland prop still suffering from pins and needles.

Ross was rushed to hospital after the Sharks' 18-10 win over Penrith on Saturday night after three forwards fell onto his back after a tackle late in the game.

X-rays cleared Ross of any fractures late on Saturday night but the 28-year-old remains in hospital waiting for an MRI scan.

Sharks doctor David Givney said he was concerned about the progress of Ross's injury.

"The wheels turn very slowly in relation to an injury of this kind," Givney said.

"We are concerned he still has some numbness and pain in his arms, however further investigation is taking place and will also have an MRI done on Ben as soon as it can be arranged by the hospital."

At this stage Ross, who is still being immobilised in a neck brace, is expected to remain in hospital for the next few days.

Cronulla players were on Tuesday planning to visit Ross in hospital.

The injury news was somewhat better for fullback Brett Kearney as scans on Monday cleared him of a potentially season-ending bone separation in his foot and ankle joint.

Kearney will still have to visit a specialist to have his scans examined but it is likely the 25-year-old will miss just one month of football and not the four months Sharks officials feared on Sunday.

"The x-rays on Brett were favourable," Givney said.

"He will visit a specialist to get his opinion in the next couple of days."

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