Jobie's on the juice for sure....

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World championship bronze medallist Jobie Dajka faces possible expulsion from the sport after attacking national head coach Martin Barras, pushing and pinning him to the ground.

Dajka's golden future in cycling may be quickly terminated today when he faces an urgent disciplinary hearing in Adelaide before the Cycling Australia chief executive Graham Fredericks.

South Australian police are also investigating an alleged assault.

It is understood several cyclists and cycling officials are shocked at what happened and furious that the sport faces intense scrutiny once again.

Dajka has been in trouble before, being dumped from the Athens Olympic team for lying to the Robert Anderson inquiry into allegations of drug use by cyclists.

It is understood Dajka assaulted Barras, breaking his glasses in the process during a counselling session with a sports psychologist in the cycling offices at the Adelaide velodrome. The counselling session had been organised after Dajka had been involved in several incidents.

The most recent had come last weekend when he and another national cyclist, Shane Perkins, traded blows after a fiery discussion about cycling's black days of last year involving the banned cyclist Mark French and the discovery of equine growth hormone in the rooms of the Australian Institute of Sport.

Perkins is a one-time training mate of French. French is still awaiting the result of his appeal heard last month before the Court of Arbitration for Sport.

Perkins is not the subject of any disciplinary board.

Cycling Australia officials would not comment on the matter last night.