The assault of a One Nation volunteer on Victoria's Surf Coast is not being treated by police as politically motivated.

"Detectives are not treating the incident as politically motivated," a Victoria Police statement said today.

News of the assault emerged yesterday, with One Nation leaders alleging the attack on Scorpio Street at about 7:45pm was because the 60-year-old man had One Nation signs displayed on his property.

Police today also clarified the victim had been assaulted with "a blunt weapon", not a baseball bat as previously reported.

A 14-year-old boy and 37-year-old man were arrested on Sunday a short time after the incident.

The man was charged with intentionally causing injury and other assault-related offences while the teenager was issued with a caution.

Police revealed today they had dealt with the 37-year-old several hours prior to the alleged assault.

They said officers intercepted him on Blackgate Road in Torquay and breath-tested him at about 4:20pm.

"The driver, a 37-year-old man from Hampton Park, allegedly returned a positive breath test and his vehicle was impounded," police said.

Federal One Nation leader Pauline Hanson yesterday visited the victim of the attack at University Hospital in Geelong.

She said the man had been knocked unconscious and suffered a brain bleed.

An online fundraiser promoted by One Nation on its social media channels has raised more than $250,000 for the victim.

Victorian One Nation leader Warren Pickering said yesterday all people and parties contesting the approaching November 28 state election should engage in "peaceful debate".

Premier Ben Carroll and Liberal leader Jess Wilson also expressed shock and concern over the incident.

One Nation was approached for comment today.