The man, in his 20s, is in a critical condition after he was found with gunshot wounds about 4.40am in Kurunjang, near Melton.

Neighbour Josh Grioli was woken by a gunshot and then heard screeching tyres as a driver sped from the scene in Walsingham Crescent.

"And then there was a girl outside just yelling 'my boyfriend's been shot, call the police'," he said.

"So that's what I did."

After paramedics controlled bleeding from injuries to the man's lower body and he was stabilised, he was taken to the Royal Melbourne Hospital, Ambulance Victoria said.

A crime scene has been established and police are investigating.

Mr Grioli said his neighbours had moved in about six months ago and he had seen little of them.

There was no noise or other indication late Wednesday night of the drama that unfolded on Thursday morning.

"I didn't hear anything at all until the gunshot this morning," he said.

Another neighbour was also woken by the single gunshot.

"My boyfriend and I were in bed and heard this really loud bang and jumped out of our skins," she said.

"When we looked outside we saw two people on the ground and heard yelling and screaming."

The injured man was being tended to by his girlfriend.

"She was trying to pin him to the ground because he kept trying to get up...there was blood everywhere."

The neighbour said the shooting occurred between Pimbit and Narebar courts, which had become troublesome in recent months.

She did not recognise either the victim or his girlfriend, and suspected they may not have lived in the street.

"It's just got worse and worse around here, crime has gone up, the drugs have gone up, it's got to the point where I just don't want to live here anymore."

Any witnesses or anyone with information is urged to contact Crime Stoppers on 1800 333 000.