Detective Senior Constable Wayne Ryan, of the Warrnambool police crime investigation unit, said an incident happened between two men aged in their 50s at a block of units in west Warrnambool about 6.15pm Thursday.

It is understood a man went to the Raglan Parade units, a window was broken, there was a physical altercation and the visitor suffered what was initially thought to be a minor stab wound to his side.

"One man received a stab wound to the side of his torso. It was initially assessed as being fairly minor," Detective Senior Constable Ryan said, who revealed a knife was involved in inflicting the injury.

"However, further medical assessment revealed the wound was more problematic. It required surgical intervention and the patient was airlifted to the Alfred Hospital in Melbourne in a stable condition last night."

Police officers, detectives and emergency service personnel attended the Raglan Parade units.

"We are looking for independent witnesses who may be able to provide some clarity about what initially happened which led to the man suffering a stab wound," the Detective Senior Constable Ryan said.

"We've spoken to neighbours who have provided police with some information, but the circumstances surrounding what initially happened remain somewhat unclear.

"We are also still seeking the whereabouts of the resident who could be expected to provide assistance and some clarity about what happened.

"He will be able to assist with our enquiries."

Anyone with information is requested to contact the Warrnambool CIU on 5560 1153 or Crime Stoppers on 1800 333 000.

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