The Wallabies are on a high after their recent series triumph against the British and Irish Lions, but Joe Roff has bad news for those Springbok supporters who think the Boks will caught them with their pants down.

The experienced Wallaby wing's emphatic message this week was that there is no chance of them underestimating the Springboks in Saturday's Tri-Nations clash in Pretoria.

"Naturally, we are very confident after our series win over the Lions, but we come here with guarded confidence. South Africa have a lot of positives going for them, despite losing to New Zealand. We have never won in Pretoria and the Boks will also have their backs to the wall. We are very wary of the game," Roff told the Cape Times.

The power of the Springbok pack is a worrying factor for the visitors, Roff admitted. The Bok tight five put the All Blacks to the sword last week and they are sure to come out smoking against a Wallaby tight five that is perceived as suspect.

"In the first Test against the Lions, we were outplayed across the park and they had a wonderful pack. South Africa are much the same in that they are a strong and physical side. It's up to us to match that. We can't afford that the Boks get on top in a very physical contest at the breakdown," said Roff.

The Wallabies are in a transition period with Eddie Jones taking over from Rod Macqueen as coach. Normally it takes a while for a coach to settle in and phase in his ideas, but Jones spent time with the Wallabies this year and had a good relationship with Macqueen, who also was his predecessor at the Brumbies.

Roff certainly doesn't expect the change in coaches to pose a problem. "Eddie and Rod are very different as coaches. Eddie has a great technical knowledge of the game, while I believe Rod was more of a facilitator. But from Eddie's point of view, he won't be out to change anything in the middle of the season."

Roff is a devastating attacker, great reader of the game and an astute tactical kicker. He scored 24 tries in his 64 Tests and would surely be looking for a blinder as this could be his last game on South African shores. At the end of the Tri-Nations the big wing is off to France, where he will join up with Biarritz.

"This year may be the last time I play for Australia. There are a lot of things about Australian rugby that I will miss and I am not ruling out a return, but once I am overseas, thing may motivate me differently. A second Tri-Nations title would be great before I head off overseas," the 25-year-old concluded.