Mike Hussey says quantity, not quality, will decide Australia's quest to prise the best Test cricket team in the world title from South Africa.
The veteran batsman has no doubt Australia have the ability, it just depends for how long they can show it in the current three-Test series.
Australia will be ranked No.1 Test nation if they win the series which continues in the second Test Adelaide on Thursday.
"We are close, definitely. I believe we can beat them," Hussey told reporters on Sunday.
"But we are going to have to play good, hard, disciplined Test match cricket for long, long periods of time.
"We can't just do it for an hour or a session, we have got to be able to do it all day and be able to back up day after day.
"That is one thing they have been able to do in the past few years ... and that is why they are the No.1 Test team.
"That is what we're aspiring to do and I don't think we're far away."
Hussey believed Australia had the right blend of players to upset the Proteas after the drawn first Test in Brisbane.
"They have got some very experienced players that have done the business over a long period of time. They know what works for them, they know their game really well," he said.
"But I think we have got a very exciting team as well, we have got some very exciting young fast bowlers coming through.
"We have got a good balance between youth and experience in our batting order as well, so I think we have definitely got a team that is only going to improve."