Former AFL coach Paul Roos will front a code of conduct hearing on Friday night after running on to the field during a Sydney junior match.

Roos could face anything from a slap on the wrist to a suspension from junior games if the hearing finds against him.

AFL chief executive Andrew Demetriou said on Wednesday the former Sydney coach was wrong to go to the aid of a junior player, injured in an off-the-ball incident.

AFL NSW/ACT announced the Greater Sydney Juniors (GSJ) Administration would conduct an investigation, and a separate tribunal hearing, following last Sunday's match between East Bulldogs and Newtown Suns.

The two clubs filed notice of an incident after a Bulldogs player was allegedly felled behind play.

Roos coaches the Bulldogs and admits running onto the field to help his player, who had suffered bruised ribs.

"AFL GSJ Administration received a complaint referred from the Newtown Swans regarding an official entering the playing field and speaking with opposition players and an opposition official," AFL NSW/ACT announced.

"This matter has been referred as a code of conduct hearing.

"A notice of complaint was referred from the East Bulldogs regarding an on-field incident between two players.

"This matter has been referred as a tribunal hearing."

Demetriou said Roos' decision to go onto the field and become involved could have easily led to more violence, and all coaches should know better.

"You can certainly make a statement that that sort of activity on the field is unacceptable," Demetriou said.

"But you shouldn't do that by running onto the field.

"It has the potential to incite more violence and it's certainly not the way we want to go about it."

Roos has defended his behaviour during Sunday's match, arguing that on-field violence should not be condoned.

He has since been praised for raising the issue as a legitimate concern.

The injured player was Darcy Cordell, the son of Swans' media manager Jenny McAsey.

Demetriou said he had nothing but praise for Roos for his contribution to the sport, but said he had gone about the matter the wrong way.

"We've spent a lot of time educating our coaches about what's right and wrong and those kinds of incidents," he said.

Demetriou said his disapproval also came from personal experience, harking back to a game he played for his local Melbourne suburban club Pascoe Vale before joining North Melbourne.

"It was a very emotional game, a lot of racial slanging going on, and a fight broke out," he said following an address on Wednesday at the National Press Club in Canberra.

"I was getting attacked by a big fellow, only to see my father appear.

"He ran onto the ground, and I thought 'Jesus'.

"So, in spite of the fact that I love him dearly, it was still inappropriate to run onto the field."

Demetriou said his dad was banned for four weeks from attending matches.

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