Police are on the hunt for video footage of a vicious assault at a Portsea hotel.

It is believed the victim, a 23-year-old man, was ejected from the hotel on Point Nepean Road by security around 8.30pm on June 12.

A fight then broke out between the man and four security staff members.

The victim was struck to the face and knocked unconscious, falling onto the road.

He later attended hospital with serious injuries.

Police believe somebody may have filmed the altercation.

They wish to speak with a man and woman.

A 27-year-old Frankston man has been interviewed and released pending further enquiries.

Anyone with any information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report to www.crimestoppersvic.com.au