Police have arrested a 25-year-old man following a stabbing in the state’s south-west.

A man in his 20s attended Portland Hospital at 12.30am with stab wounds.

He received treatment for his injuries, but died shortly after arriving at hospital.

The man is believed to have been stabbed in a toilet block in Henty Street just after midnight.

A crime scene has been established around the public toilet.

Police are not searching for anyone else in relation to the stabbing at this stage.

Any witnesses or anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at crimestoppersvic.com.au