A man has suffered serious burns to his face, chest and arms after the manager of McDonald's at King Cross allegedly threw hot oil in his face.

Kings Cross police are yet to charge the manager with any offence, and are still investigating whether the manager was acting in self-defence, the Wentworth Courier reported.

At about 3.30am on Friday February 10, the victim was ordering food with a friend at McDonald’s on Darlinghurst Rd.

Police say the victim was moderately affected by alcohol when he became involved in a verbal argument with the McDonald’s manager.

The victim is alleged to have swore at the manager and threatened to kill him, when the manager allegedly replied, "If you come over the counter, I’ll throw oil on you".

The victim then jumped the counter which is when the manager has thrown the oil directly at the man’s face.

The oil caused significant and serious burns to the victim’s face, chest, torso and both arms.

The victim was taken to St Vincent’s Hospital then transferred to the Burns Unit at Concord Hospital.

Police received statements from a number of witnesses and are reviewing CCTV footage of the incident.