Adam Voges has been diagnosed with concussion and ruled out of the rest of WA's Sheffield Shield match against Tasmania after being hit in the head by a bouncer in a Sheffield Shield match.

Voges was 16 not out when a delivery from Tasmania's Cameron Stevenson hit him on the helmet as he tried to turn away and avoid the short ball, shortly before lunch on day one.

He dropped to his arms and knees and lay on the ground for some time before he was assisted from the ground by trainers and retired hurt.

He has been ruled out of the rest of the match after being diagnosed with concussion.

Voges was looking for runs in Shield cricket after featuring in Australia's innings and 80-run defeat to South Africa in Hobart in the second Test.

"He's OK. He's got a bit of a headache, and he's not feeling 100 per cent. But he's fine," WACA general manager of high performance Ben Oliver said.

"There was no loss of consciousness. There was no neck injury. He's been assessed.

"He's being monitored by our medical officer here, and they've deemed there's no need for him to go to hospital.

"He's resting at the moment, watching the game."

Oliver said Voges was wearing the appropriate head gear, even though it didn't contain a non-compulsary neck guard.

"He's wearing the current model helmet that's compliant with the British standards," Oliver said.

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Two ambulances were present at the WACA on Thursday, but neither were needed.

At lunch on day one, WA was struggling at 4-78, with Sam Whiteman on 15 and Ashton Turner on 14.

Opener Cameron Bancroft's hopes of pushing his case for a Test debut were dashed when he was dismissed for just two.

WA slumped to 3-15 when Michael Klinger edged Jackson Bird to slip and it was 4-40 when Hilton Cartwright departed for 18.

Voges entered the match needing a big score to save his Test career.

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He dug in deep early, helping to steady the ship after the early onslaught.

But his game was brought to a premature end when he unsuccessfully tried to evade a rising delivery from Stevenson.

Voges missed three days of an English county game in May this year with concussion when he was hit in the head by an errant throw from the boundary.

"It felt like I was waking up with a hangover. It wasn't until 10 days after it (happened) that I started to feel right again," Voges said of that incident.

ABC/AAP