Rassie Erasmus has openly acknowledged that the Springboks will benefit from Joe Lewis' intimate knowledge of England's systems when the sides meet at Ellis Park on Saturday.
Lewis, who worked as an analyst with Steve Borthwick's England during this year's Six Nations, joined the world champions a few months ago in a technical analyst role. Asked during a media briefing on Monday whether Lewis' background gave the Boks an advantage, Erasmus was direct.
"Yeah, of course. He's familiar with England. Without a doubt," Erasmus said.
The Bok coach framed the appointment within the broader reality of modern international rugby, where coaching and analytical expertise routinely crosses borders. Erasmus cited Matthew Proudfoot's move from South Africa to England in 2019, and Eddie Jones' subsequent shifts from England to Australia and Japan, as examples of how intellectual property inevitably transfers between rival camps.
"There's a guy called Byron McGuigan, and he spent a whole week with us as Sale Sharks coach and I'm pretty sure he has a lot of stuff," Erasmus said. "So obviously some IP gets transferred, and it's the same with Joe."
Modernising the Analysis Department
Erasmus stressed that Lewis was not recruited solely for his England connections. The appointment forms part of a deliberate effort to expand and modernise the Springboks' analysis operation to match the leading nations in world rugby.
"I still think we're far off the other Tier One nations," Erasmus admitted. "They've got more analysts. We were always in a mode where one analyst gathered the data and then the coaches filtered it."
Lewis now works alongside Lindsay Weyer and head of athletic performance Paddy Sullivan, with each taking responsibility for different areas of analysis. The structure mirrors Erasmus' broader approach of importing expertise from outside South Africa's traditional coaching pool, following the appointments of Felix Jones, Jerry Flannery and Tony Brown in recent seasons.
With England arriving in Johannesburg for the Nations Championship opener, the Lewis factor adds another layer to a fixture that has produced narrow margins in recent encounters. Whether his inside knowledge proves decisive on Saturday will depend on how effectively the Boks translate analytical insight into on-field execution at altitude.