A Melbourne teenager with links to boys accused of planning terrorist acts on home soil has reportedly died while fighting for Islamic State in Syria.

The family of 19-year-old Irfaan Hussein has confirmed he died in March, News Corp reports.

But it is not clear whether the teenager was beheaded while trying to return home or killed in a bomb blast.

Mr Hussein, who called himself Abu Sufyan Al Australi, was close friends with with Numan Haider, who was shot dead last year after stabbing two Melbourne police officers.