Springbok scrum-half Ruan Pienaar has warned returning Wallabies Matt Giteau and Drew Mitchell about the speed of southern hemisphere rugby.
Pienaar, who plies his trade at PRO12 outfit Ulster, believes Giteau and Mitchell, who play in the Top 14 with Toulon, will be surprised by the fast-paced tempo of the game when they run out for Australia against South Africa in their Rugby Championship opener in Brisbane on Saturday.
"The pace of the game is a massive difference," said Pienaar.
"Where I'm playing at the moment (Belfast), the weather's not that great. Northern Ireland gets all the wet weather in the northern hemisphere. I hardly see the sun.
"I really need to work hard on my fitness and getting around in the game and I guess that's going to be the same for them.
"For me, watching Super Rugby, the games have been really quick.
"For us coming from the northern hemisphere, it's adapting to that again. That's the biggest thing."