Former Essendon high performance boss Dean Robinson now consulting for Sydney Roosters in the NRL

A KEY figure in the Essendon supplements sage, Dean ‘The Weapon’ Robinson has made a return to professional sport by going back to where it all began.

Dean Robinson with James Hird at Essendon training.

DEAN “The Weapon” Robinson — one of the key architects of the Essendon drugs regime — is back working in professional sport.

The Herald Sun can reveal Robinson, who was never charged over his role in Australian sport’s greatest scandal, is consulting for the Sydney Roosters in the NRL.

Robinson’s brother, Trent, is the club’s senior coach.

An NRL spokesman said: “Dean Robinson has been given approval to be registered to work in the NRL. His registration is subject to some conditions”.

Those conditions prevent Robinson from working with sport supplements.

A Roosters official last night confirmed Robinson was working in a “consultancy role” to the club’s fitness department.

Robinson was Essendon’s high-performance boss from late 2011 until February 2013 and helped establish the Bombers’ “pharmacologically experimental” drugs program alongside sports scientist Stephen Dank.

He was stood down on February 5, 2013 — the day the Bombers “self-reported” to the Australian Sports Anti-Doping Authority and the AFL — and just days ahead of the infamous “Blackest Day in Sport” press conference.

Essendon’s former high performance coach, Dean 'The Weapon' Robinson.

Robinson later pocketed a $1 million wrongful dismissal payment from Essendon after issuing Supreme Court subpoenas against AFL chiefs Andrew Demetriou and Gillon McLachlan, Bombers bosses David Evans and Ian Robson and current league spin-doctor Elizabeth Lukin, who was hired by the Dons to assist with the crisis.

It was Robson, attending a crisis meeting at AFL House on February 5, 2013, who ordered Bombers football manger Danny Corcoran to immediately stand Robinson down.

Dank, who reported to Robinson, was slapped with a lifetime ban by the AFL two years ago.

BOMBER SCANDAL: MICK GATTO ASKED FOR HELP

BOMBER SCANDAL: FOOTY BOSS SPEAKS

BOMBER SCANDAL: LISTEN TO THE EXPLOSIVE TAPES

ASADA has failed to explain why Robinson was never pursued over his involvement in the Essendon scandal or the alleged use of banned supplements during his time at the Gold Coast Suns.

Robinson and Dank worked together at the Suns in late 2010 before reuniting at Essendon.

Leaked transcripts from the AFL anti-doping tribunal hearings into the Essendon drugs saga reveal Robinson suggested to Suns defender Nathan Bock that he should tell a hospital pharmacy that he needed to buy syringes for his girlfriend — rather than admit that they were for him to inject substances into himself.

Robinson told ASADA investigators that Bock visited his Gold Coast home where he gave him the banned substance CJC-1295 in a green cooler bag packed with dry ice in late 2010.

Robinson claimed Dank had told him the drug was not banned and would help Bock with an Achilles injury.

Dank has since confessed to giving CJC-1295 to Bock.

Robinson and Dank teamed up at Essendon in 2011 and masterminded the Bombers’ supplements program, which later saw 34 players suspended for the use of the banned peptide, Thymosin beta-4.

Dean Robinson is consulting for the Sydney Roosters in the NRL.

The Herald Sun revealed last year that Robinson agreed to give information to ASADA investigators just days after the Bombers scandal erupted.

There was no formal agreement for immunity, but Robinson helped investigators on the basis of an “understanding”.

“It was made clear he would be looked after ... but it was not guaranteed,” a source close to the investigation said.

“He provided the material that was wanted.”

Robinson later landed a job with AFL auditor, KPMG.