The NRL made a knee-jerk decision to block Danny Buderus's part-time job in Super Rugby and Jake White should continue his pursuit of a rugby league player to help rugby's tackling technique, former ACT Brumby and Brisbane Bronco Peter Ryan says.

The Brumbies have given up any slim hope they had of keeping Newcastle Knights great Buderus as collision coach just a day after unveiling him as their newest recruit.

White will likely continue his bid to recruit an expert from rugby league to boost his team's title chances for next season.

The NRL stepped in to scupper the proposed partnership, which would have had Buderus coach with the Brumbies once a week while completing the final year of his rugby league contract.

But Ryan - who made the transition from the Broncos to the Brumbies a decade ago - said the NRL had missed the perfect chance at cross-code publicity.

The former Queensland State of Origin forward said rugby league greats Nathan Hindmarsh and Petero Civoniceva would be a perfect fit in Canberra if White was still chasing an NRL recruit.

''I think it was a knee-jerk reaction and the NRL is within its rights to have that reaction because they believe they've been wronged,'' Ryan said.

''To get someone of Danny's calibre in [to help the Brumbies] was a smart move from my point of view.

''In terms of what rugby union is after, it's more about attitude and someone like Nathan Hindmarsh could get that across.

''It doesn't matter if you can or can't tackle, it's about do you want to make the tackle and be aggressive.

''Getting a rugby league guy across is good … Hindmarsh or even Petero Civoniceva would be a good coach at that.''

Buderus's stint with the Brumbies lasted just hours. At midday on Thursday he was announced as the latest recruit to White's coaching staff and by 5pm the NRL had blocked the move.

Buderus didn't even complete a scheduled training session.

It is understood White has started working on a list of potential candidates to fill the role.

The collision coach job was created to make the Brumbies more physical during games.

White wants the players to be more effective when they tackle their opposition and be more destructive when trying to get over the advantage line against a set defence.

His plan was to use the techniques developed in rugby league ''because rugby league is years ahead of rugby in terms of tackling technique''.

Ryan joined the Brumbies in 2000 after a decade with the Broncos and was recruited because of his defensive workrate. He won a title with the Brumbies in 2001 and, in his last year as a player, was asked by the coaches to help his teammates improve their tackling techniques.

North Queensland assistant Ryan believes the NRL has missed a chance at cross-code promotion by disallowing Buderus's position.

''He would be promoting rugby league more than he would rugby union because of the fact he would be teaching them how to tackle and run,'' Ryan said.

''Having played both codes … I had a fantastic time with the ACT Brumbies and when I came in they were looking for a professional attitude and I hope I portrayed that.

''They would be looking for the same thing with Danny … I think it would have only been a good thing for rugby league.''