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.

West Indies talisman Chris Gayle has targeted matching the exploits of India great Yuvraj Singh who once cleared the boundary rope six times in one over.

Singh, who retired from cricket in June of last year, achieved the feat in 2007 in a league-stage match of the inaugural T20 World Cup when he clobbered Stuart Broad.

The India legend achieved the feat on the biggest stage, but six other cricketers have also managed the achievement.  West Indian legend Gary Sobers, Ravi Shastri of India, Herschelle Gibbs of South Africa, Ross Vitali of England, Hazratullah Zazai of Afghanistan, and Leo Carter of New Zealand.

Despite being 41, Gayle still fancies his chances of becoming the eighth player to do so.  Based on his recent performances at this season's IPL, one wouldn’t bet against it.  It was at the IPL this season that Gayle became the first player to get to 1000 sixes in T20 cricket.  The big left-hander went close to the feat in 2016 when he hit five sixes in an over off Sulieman Benn in the Caribbean Premier League (CPL).

"It’s very much possible to hit six sixes.  So, if six is possible and Yuvraj has done it before so why can’t I do it? Yes, you, I anybody can do that,” Gayle told the Hindustan Times.

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."