Australia's National Rugby League has blocked a move from the Brumbies to employ former league international Danny Buderus as their tackling guru.
Buderus, who has played 24 internationals, had earlier been announced by the Brumbies as joining Jake White's coaching staff. But the NRL reacted swiftly and sought an explanation from Buderus' NRL club, Newcastle Knights.
"Neither Danny Buderus nor the Knights have sought permission from the NRL to enter into a third party agreement as his playing contract requires and as the club is required under the salary cap rules," acting NRL Chief Executive Shane Mattiske said in a statement.
"It is hard to envisage any circumstance where an agreement could be approved that allowed a current NRL player to promote another code competing in the same market as an NRL team."
White, the former South Africa World Cup-winning coach, had sought out Buderus to help improve his team's defence in his second season at the Brumbies and saw the former 34-year-old Test hooker as the perfect mentor to make that happen.
In 15 years as a league player, Buderus captained New South Wales to their last State of Origin series win over Queensland in 2005, won an NRL Grand Final with the Knights in 2001 and an English Super League title with Leeds in 2011.