The father of an autistic teen bashed unconscious by up to eight men at the weekend has threatened to protest on the steps of Parliament over what the family perceives as government inaction on "gangs" in Melbourne's suburbs.

Jayden D'Abaco, 19, was chased and beaten in a "spontaneous" attack by the group, described as being African in appearance, as he walked alone to the Mynt Lounge nightclub in Werribee about 10.30 on Saturday night.

Autistic teen Jayden D'Abaco after he was attacked on Saturday night

What was meant to be a fun night celebrating an unlikely victory by the Wyndham Suns reserves in a local AFL match ended with Jayden, from Tarneit, in hospital suffering a fractured cheekbone and severe bruising.

Police, who are appealing for CCTV footage and witnesses, have described it as a "cowardly .... spontaneous, opportunistic attack".