Investigators believe that more than one offender may have been involved in the assault on the Hamilton man.

The incident is thought to have occurred between Kenna Avenue and Tyers Street, possibly on or near Bree Road around 1.30am.

It is believed the victim left an address in Kenna Avenue at about 1.15am and he was found by his mother at a Bree Road address about two hours later. The 22-year-old was taken to Hamilton Hospital with serious injuries.

Hamilton criminal investigation unit detectives are now appealing for witnesses and anyone with information to contact Hamilton police station on 0481 387 374 or Crime Stoppers on 1800 333 000 or www.crimestoppers.com.au

Meanwhile, police have appealed for information from the public to help unravel a puzzling incident where a man wandered into Warrnambool's Lyndoch aged-care centre yard with face injuries and collapsed yesterday afternoon.

Detective Senior Sergeant Mark Canavan said a male aged in his mid-to-late 20s walked through the Marfell Road driveway, sat down on a grassed area then passed out.

"He had injuries to his face and seemed to be affected by alcohol. Police were called and he was taken to hospital by ambulance," the detective said.

"He is of medium build with dark hair and Islander appearance. If anyone can help explain the circumstances of him being there with injuries they should contact the police ."

Elsewhere, a man was taken to hospital with severe arm injuries after he punched his fist through a glass door in Warrnambool early yesterday. He left a trail of blood on the footpath from the Jenny Craig weight loss centre on Darling Street to a Banyan Street house where he was given first-aid treatment.

malexander@fairfaxmedia.com.au