Two men have pleaded guilty to the vicious assault of two brothers in a Melbourne lane way which left their victims mentally scarred.

CCTV pictures captured the moment Anthony and Paul Costantino were set upon by a group of men in a Brunswick lane way in November last year.

The vision shows both men repeatedly punched and knocked to the ground with their heads stomped on.

Hassan Abdallah walked into court with the assistance of another man. (9NEWS) (9NEWS)

As one of the brothers attempted to get up he was knocked down again, while the group of attackers continued stomping on the head of the other.

The attackers were relentless with a final sickening blow to the back of the head knocking Paul unconscious.

Today a court heard 21-year-old Hassan Abdallah was the chief aggressor in the attacks on the two brothers.

John Wassouf running into court in Melbourne today. (9NEWS) (9NEWS)

He and his co-accused John Wassouf, 21, had been heavily intoxicated at the Penny Black bar.

The court heard how Wassouf approached the victims' girlfriends on the dance floor and tried to force the women's heads together to make them kiss.

After one of the men was ejected from the club, he and a group waited for the victims to leave the bar.

Anthony Constantino's victim impact statement. (9NEWS) (9NEWS)

Paul Constantino's victim impact statement. (9NEWS) (9NEWS)

In a victim impact statement read to the court, Anthony said "my life has not been the same since. I have constant anxiety and feel I can't go to bars and nightclub venues without fear of being attacked".

His brother Paul said he had "constant anxiety and paranoia. I'm picking up the pieces of my former self".

Abdallah and Wassouf pleaded guilty to charges of intentionally causing injury.

Wassouf is expected to be given a community corrections order.