A man has suffered serious head injuries in an overnight assault outside a nightclub in Dublin.

Emergency services were called to the night club at Airside Swords at about 3:40am this morning.

The injured man - believed to be in his thirties - was rushed to Beaumont Hospital where he is being treated for serious head injuries.

Gardaí have appealed for anyone who may have witnessed an altercation between two men outside club between 3:00am and 3:30am to come forward.

Officers are particularly interested in speaking to the driver of a light or bright coloured taxi who picked up a man on the roadway close to where the injured man was being treated.

Gardaí said there was at least one other occupant in the taxi at the time.

The man who got into the taxi is described as wearing a light coloured short-sleeved t-shirt and dark trousers.

The scene is preserved and a Garda investigation is underway.