Australia will hope the "very likely" return of David Warner can inspire them to regain the series lead as they take on India in the third Test from Thursday.

India produced an impressive turnaround in Melbourne last time out, squaring the series at 1-1 despite being without Virat Kohli and also losing the toss.

Stand-in Ajinkya Rahane stood up in the absence of India's captain, making 112 to set the tourists up for an impressive eight-wicket victory.

However, Australia are undefeated in their last nine Tests against India at the Sydney Cricket Ground. Indeed, their only defeat in meetings between the teams at the venue came in January 1978.

The hosts reacted to the defeat by dropping out-of-sorts opener Joe Burns, having made just 63 runs in four innings during the series.

Warner and Will Pucovski were both injured and missed the first two Tests but head coach Justin Langer gave a positive update on the former, who he thinks will be able to play through the pain.

Uncapped prospect Pucovski, meanwhile, has passed concussion examinations so will challenge Travis Head for a place in the side.

BUBBLE CONCERN FOR INDIA

India had to isolate five members of their squad as a precaution in the aftermath of the Boxing Day Test, amid concerns over a breach of protocols within the bio-secure bubble.

Rishabh Pant, Rohit Sharma, Shubman Gill, Navdeep Saini and Prithvi Shaw trained away from the rest of the squad after a video on social media showed them dining at an indoor venue in Melbourne.

However, both teams - and members of the support staff - tested negative for COVID-19 prior to travelling to Sydney to continue the four-match series.

Rohit has not featured for India on the tour so far due to injury, including missing the white-ball games that preceded the Tests, but could be involved at the SCG.

Batsman KL Rahul is out of the rest of the series with a wrist injury, ending speculation he could replace struggling Mayank Agarwal.

LANGER CONFIDENT OF SMITH RECOVERY

While the expected return of Warner could give them a boost, Australia will also be looking for a turnaround from Steve Smith.

Smith has only managed scores of 1, 0 and 8 during his completed innings in Adelaide and Melbourne, with spinner Ravichandran Ashwin having him caught in two of those three dismissals.

Ranked at three in the ICC rankings, he had only failed to reach double figures in two of his 14 previous innings since returning to Test cricket in the 2019 Ashes.

"Imagine how good we'll be when he does start batting well," said a confident Langer. "That's how I look at it.

"He hasn't had the best of series so far, he'll be the first to admit that, but my gosh, what I know about great players is the longer they miss out, the sooner it is that they're coming good again.

"So that puts a big smile on my face. I don't coach Steve Smith. Steve Smith coaches himself and I'm sure he's going to work it out. 

"He is a great player and I can't wait to watch him bat this Test match and the next Test match."

KEY OPTA FACTS

- India have lost only two of their last nine Tests against Australia (W5, D2) - they now search for back-to-back wins against them for just the second time since 2013.
- Australia's loss in the second match snapped an eight-game winning run in Tests at home; they will now look to avoid consecutive home defeats for the first time since November 2016.
- The home team dropped eight catches last time out in Melbourne, their most in a single Test since dropping nine against India in the New Year's Test of 2012 in Sydney.
- Ricky Ponting (8) is the only player to have logged more centuries at the Sydney Cricket Ground than David Warner (7) in international cricket.
- No player has taken more wickets (10) or posted a better bowling economy (2.1) than India's Ravichandran Ashwin throughout this series.
- Nathan Lyon is six wickets shy of becoming just the third Australian bowler to take 400 in men's Tests (Shane Warne, Glenn McGrath); his 89 wickets against India are his most against any team.

Crowd capacity for the Sydney Test between Australia and India starting on Thursday has been reduced to 25 per cent.

Questions were raised over the venue of the third Test after a coronavirus outbreak in New South Wales.

The clash will go ahead at the SCG, but on Monday it was announced the crowd capacity had been cut from 50 per cent to 25.

"In response to the public health situation in NSW, we are working closely with Venues NSW and NSW Health to put appropriate biosecurity measures in place for our staff, players, match officials, broadcasters and fans to ensure we play the third Test at the SCG safely," Cricket Australia (CA) interim chief executive Nick Hockley said.

"Reducing the capacity of the venue is crucial in achieving social distancing requirements, and we sincerely thank ticketholders for their patience, as we process refunds today, reconfigure the SCG seating plan to deliver these social distancing measures and go back on sale."

The four-Test series is locked at 1-1, with some doubts now over the venue for the final match – due to be held in Brisbane.

Meanwhile, Australia paceman James Pattinson has been ruled out of the Sydney Test due to bruised ribs suffered in a fall at home.

David Warner admitted it was unlikely he would be fully fit for Australia's third Test against India, but the opener is hoping to play.

Warner has missed the opening two Tests of the series, which is locked at 1-1, due to an adductor injury.

The left-hander's return in Sydney, where the third Test begins on Thursday, would be a huge boost to Australia's struggling batting line-up.

But Warner said on Saturday it was unlikely he would be at full fitness for the clash.

"We've got a training session today and tomorrow so I can't give you any more indication of where I'm at. I haven't ran the last couple of days but after today and tomorrow it will probably give me a better indication of where I am," he told a news conference.

"Am I going to be 100 per cent? Highly doubtful. But I'll be doing everything I can to get on that park and play and even if that means I'm not 100 per cent, I'll be doing everything I can to let the selectors give me that green light."

Australia's highest score of the series so far came in the second innings in Melbourne as they made 200.

Warner's return would be a major boost, but the opener said he was likely to be restricted if he played – and his running between wickets would be a key factor.

"Batting in the nets the other day it probably actually helped me because I had to wait for the ball to be in my actual area and I didn't have to throw my hands at it so it made me play nice and tight," he said.

"For me, you're going to have some restrictions here and there but at the end of the day it's about myself. When you get into the game, adrenalin takes over as well so you don't cast any doubt over the fact that you can't play those shots."

Warner added: "For me, it's about my speed between wickets, that's all that matters, it doesn't matter about what shots I can and can't play, it's about the drop and run, helping the guy at the other end get off strike, they're the things that I work on and they're the things I like to be 100 per cent fit for.

"In this case, I'm most likely not going to be, but I'm going to have to try and work out myself in the nets how I'm going to manage that and that's the most important thing to myself and this team."