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Western Australia has recorded no further COVID-19 cases linked to two truck drivers who tested positive after travelling through three states.

The two drivers were tested as part of routine surveillance in NSW on Wednesday, but being essential workers were allowed to embark on their journey through Victoria and South Australia to WA, where they arrived on Thursday night.

They received their test results on Friday and their employer informed WA Health.

The drivers, aged 23 and 29, wore face masks and slept in their truck cabin after arriving in the Perth suburb of Kewdale.

Premier Mark McGowan says contact tracers have identified 20 close or casual contacts, two in Perth and the rest in regional WA. All are in isolation.

"Our health advisers have indicated that the risk from these two truck drivers is very low and everything is being done to manage the situation in accordance with the health protocols," he told reporters in Broome.

"The system we have in place worked ... obviously we'll continue to monitor and put in place every precaution to keep the West Australian community safe."

The premier reiterated that the pair had done nothing wrong.

"They have done a hard job in which they drive across Australia, doing long hours and delivering supplies to the communities of this country," he said.

"When they learnt that they were COVID-positive, they notified the relevant people immediately."

On Saturday, SA Health listed two petrol stations in Port Augusta and another two in Ceduna, where the drivers are believed to have stopped on their journey through the state.

Anyone who was at the locations at the specified times must quarantine for 14 days and undergo several COVID tests during that time.

Public health alerts have already been issued in WA for a BP Truckstop in Norseman, the IOR Petroleum Fuel Station in Widgiemooltha, the Shell Fuel Station in Southern Cross, and the Mobil roadhouse in Yellowdine.

Anyone who visited the venues during the listed times must get tested and isolate for 14 days, but broader restrictions have not been introduced in the state.

The testing regime that caught the men's infection, but also allowed them to travel with a test result pending, has been in place for more than a year.

"This is the first time, to the best of my knowledge, it's ever thrown up a positive case," Mr McGowan said.

The announcement came after Friday's national cabinet meeting, at which the WA premier defended his refusal to agree to drop borders once the nation achieved 70 per cent vaccination coverage.

"The whole idea that at 70 per cent vaccination you deliberately infect people, I just can't tolerate it," he told reporters.

© AAP 2021

Latrell Mitchell needs a miracle at the NRL judiciary to save his season with the South Sydney superstar facing up to nine games out for the hit that floored Joey Manu.

The NRL's match review committee came down hard on Mitchell on Saturday, slapping him with a grade-two reckless high tackle charge for his ugly shot.

It was one of three charges levelled against Rabbitohs players, with Liam Knight also facing between two and three games out for a hip drop that injured Siosuia Taukeiaho.

Dane Gagai is also facing a $1600 fine for twice swearing at referee Ashley Klein after he was sin-binned late in the match following a melee.

But none of those charges will hurt as much as Mitchell's, after his old teammate Manu was sent to hospital with a suspected fractured cheekbone.

The grade-two reckless high tackle charge is effectively the fifth highest possible grade out of nine that can be handed down for high shots.

Mitchell can accept the charge and cop a six-game ban, ending his season and meaning he will have a delayed start to 2022.

Downgrading the charge to a grade-one reckless high tackle would also not be enough to allow him back on the field this year, resulting in a five-game ban.

It means he would have to get the charge downgraded two levels to a grade-three careless high tackle, which would get him a four-week ban.

Even then, he would only return in the grand final if Souths lost in the first week of the finals to Penrith but then went on to reach the decider.

Adding further issues for Mitchell is if he does head to the judiciary to downgrade or fight it altogether and is unsuccessful, the ban will extend to nine games and well into 2022.

Mitchell's plight is not helped by the fact he has four priors, three of which came in the one game this year against Wests Tigers as well as a striking charge against the same opponent in 2020.

It comes after the Rabbitohs led calls for judiciary reform earlier this year, arguing loading on charges should be capped at 25 per cent.

Mitchell's loading in this instance is 80 per cent.

Regardless, it represents a huge blow to the Rabbitohs' title hopes in what was effectively a meaningless game for the club.

The 24-year-old went to another level at fullback this season, offering hope Souths could challenge title fancies Melbourne and Penrith after he missed last year's finals series with a hamstring injury.

"We'll have to wait and see," coach Wayne Bennett said when asked if they could win the title without Mitchell.

"He's a huge player for us, but we didn't have him last year in the playoffs and I think we're a better team than we were last year and pretty good at getting other players to play well for us in key positions.

"We've won a lot of games this year with a lot of players missing."

Meanwhile the charge will also raise questions as to why Mitchell was not sent off, with Roosters coach Trent Robinson already furious the fullback was only sin-binned.

© AAP 2021

Latrell Mitchell's NRL season is all but over with the South Sydney superstar facing up to nine matches out for the hit that floored Joey Manu.

Mitchell was on Saturday charged with a grade-two reckless high tackle, meaning he can accept a six-week ban for the shot.

The only way he can play again this year would be to try and downgrade the charge at the judiciary, but that would risk the ban extending to nine games.

© AAP 2021