Wallabies back Christian Lealiifano said Monday the team remain unified despite three straight losses under new coach Ewen McKenzie.

Their 38-12 defeat to South Africa in the Rugby Championship in Brisbane at the weekend was Australia's fourth defeat in a row and the third since McKenzie took over from Robbie Deans.

The pressure is building on the Wallabies ahead of Saturday's Test against Argentina in Perth which could decide the destination of this season's wooden spoon in the southern hemisphere tournament.

Australia have not lost to the Pumas since 1997 in Buenos Aires and inside centre Lealiifano said the team remained upbeat despite their disastrous start to the Rugby Championship.

"The boys are really tight," Lealiifano told reporters.

"It's tough when you're not getting the results. Everyone sort of looks back on the team culture and thinks that it might take a bit of a hit.

"But the boys are really sticking tight and not much is fazing us. We've just got to look after our own game and hopefully produce the results."

Both the Wallabies and Argentina have yet to win in this year's four-nation series, although the Pumas have a bonus point to relegate Australia to last spot at the halfway stage of the tournament.

McKenzie said Sunday he may have to change his attacking game plan after Australia slumped to their worst losing streak in four years against South Africa.

The Wallabies have won just one of their six Tests this season following Saturday's record mauling by the Springboks and they are fighting to avoid a fifth straight loss and a run not seen since Eddie Jones' ill-fated last year in charge in 2005.

Under McKenzie, the Wallabies have conceded a total of 12 tries in two losses to the All Blacks and one to the Springboks.

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