Solomone, 15, was fatally stabbed at Brimbank Shopping Centre in Melbourne's west on June 16.

Nine boys aged between 13 and 17 are charged with murder, as well as two men, Taataa Tafa, 20, and Soreysa Jibrael, 23, over the stabbing.

The incident allegedly involved a gang dispute and led to the most murder charges laid over a single death in Victoria.

Tafa faced magistrate Kieran Gilligan on Wednesday and pleaded not guilty to four charges including violent disorder, affray and murder.

No application for bail was made by Tafa's lawyer Emma Turnbull.

Jibrael is facing five charges including violent disorder and murder.

His lawyer, Erin Byrt, did not enter a plea before Mr Gilligan on Wednesday and did not apply for bail.

Earlier this month eight of the teenagers accused of murdering Solomone were granted bail.

But Justice Paul Coghlan ruled they must not have any contact with their co-accused or be a part of a group of more than five people.

"As soon as you get back into those sort of groups that's when bail's going to be breached and create difficulties," Justice Coghlan said.

The boys are subject to a curfew and must attend school, but must not go near the shopping centre where Solomone was stabbed.

Justice Coghlan noted in a previous hearing that a Supreme Court trial may not happen before 2022.

"You might think about how undesirable you might think it to be to be locked up for that period of time," he told the teenagers.

Jibrael will next face court on December 10.

Tafa will face the Victorian Supreme Court on December 14.

Australian Associated Press