Two men have been seriously injured following a reported home invasion at a property in Lalor Park, in Sydney's west, on Tuesday morning.

Emergency services were called to the property at about 7:30am after receiving reports that two men had entered a home. Police were told the intruders allegedly assaulted two men who were inside the property before leaving the location.

The two occupants, aged 64 and 44, suffered head injuries during the incident. They left the property after the alleged assault and were treated by paramedics nearby.

Both men were subsequently taken to hospital in serious condition for further medical assessment and treatment.

Police established a crime scene at the Lalor Park property as investigators began examining the circumstances surrounding the alleged home invasion. Officers are expected to assess the scene and gather information about what happened before, during and after the reported assault.

The identities of the people who allegedly entered the property have not been released. Police have not indicated whether anyone has been arrested in connection with the incident at the time of the latest report.

The investigation is focused on establishing who entered the home, what occurred inside the property and the circumstances that led to the two occupants sustaining serious head injuries.

A home invasion can involve significant risks to people inside a property, particularly when an alleged confrontation occurs. Police investigations into such incidents generally involve examining the crime scene, speaking with injured people and witnesses, and reviewing any available evidence that may help identify those responsible.

Lalor Park is located in Sydney's western suburbs and forms part of the Blacktown local government area. The incident prompted an emergency response during the morning, with police and ambulance crews attending the area.

The condition of the two injured men remains serious. Their medical treatment and any further assessment will determine whether additional updates are provided.

Police have established a crime scene and the investigation remains ongoing. Further information may become available as detectives continue their inquiries.

At this stage, the circumstances surrounding the alleged home invasion have not been fully established. Any allegations against unidentified offenders remain subject to investigation and should not be treated as proven.