Josh Hazlewood has been cleared of a hamstring strain with Australia confident the seamer will be fit for the first Ashes Test after a nightmare day at the SCG.

Hazlewood and fellow Test squad member Sean Abbott both left the SCG for scans during NSW's 300-run Sheffield Shield loss to Victoria, after feeling tightness while bowling.

The news was somewhat good for Hazlewood, who will fly to Perth and train as normal.

But Abbott's chances of debuting this summer have taken a significant hit with a "moderate-grade" injury.

Australia had wanted their full bowling attack of Hazlewood, Mitchell Starc, Scott Boland and Nathan Lyon to feature at the SCG this week, before the Ashes begin next Friday in Perth.

With captain and pace ace Pat Cummins already missing the start of the series with a back injury, the last thing Australia needed were further injuries this week.

Australia's stand-in captain Steve Smith admitted he began to fear the worst after Hazlewood told him he was feeling tightness at the end of his fourth over on Wednesday.

"I was like: 'Get off the field, disappear, you're done, go and figure it out'," Smith said.

"Then it was what do we do with Starc? Do we just put him on ice completely?

"It's hard when you're playing in a game and you want to try and do well for your state as well. Then you've got an eye on, obviously next week.

"I was like, Boland, you can bowl one spell (for Victoria) and be done as well, that'll be good. But he got through by the looks of things nicely, so that's ideal."

An injury-enforced Hazlewood omission would be a significant blow for Australia, who haven't played without two of their 'Big Three' fast bowlers since December 2022.

If Hazlewood is a late scratching from the first Test it would likely result in a debut for Brendan Doggett.

Doggett has taken two five-wicket hauls since returning from a hamstring injury for South Australia and is one of the form bowlers in the country.

"He's been bowling really well the last couple of games from what I've seen," Cummins said of Doggett at a Cricket Australia NRMA sponsorship extension on Wednesday.

"He's really well placed to be vying for a spot in that first Test. It's always nice to have a squad full of people in form and he's certainly one of those guys."

Meanwhile, Cummins said he was feeling well after bowling at 90 per cent on Tuesday in the SCG nets.

He is a chance of playing in the second Test at the Gabba on December 4, but the third Test in Adelaide on December 17 could be more realistic.

"(The Gabba) is what we're building towards," Cummins said.

"Hopefully by Perth I'm up there near 100 per cent, and then see where we're at.

"It's still pretty aggressive, going from nothing to trying to get ready for a Test match in four weeks. But we're going to give it a good shot."

The injury scares could also place more importance on Cameron Green's fitness for the first Test, and whether Beau Webster remains in the side as a second allrounder.

Green sent down eight overs in the first innings in Perth on Tuesday at good pace in what was his biggest bowling output in a match since back surgery last summer.

Webster also took eight wickets for the match in Tasmania's Sheffield Shield loss to South Australia this week.

But he is fighting to keep his spot in the Test side as selectors consider going with specialist opener Jake Weatherald.

"It's nice to have the options there if we feel we need to go down that path at all," Smith said.

"We've got Greeny, who bowled well from what I've heard in their game. And Slug (Webster), who took five as well."