A man has been charged after he allegedly punched a police officer in the face, knocking him unconscious, in Sydney‘s south-west early this morning.

The alleged attack occurred after officers broke up a fight between the 23-year-old and a woman known to him outside a home in Lansvale, near Liverpool.

Police were called to the Huntingdale Avenue property at 1.10am over a noise complaint.

Huntingdale Avenue in Lansvale, where a police officer was knocked unconscious in the early hours of this morning. (9News)

When they arrived, they found the pair, both aged 23, arguing outside the home.

The row became physical and police intervened, separating them.

While officers were speaking to the woman, the accused approached a male sergeant and confronted him.

Police allege he then punched the sergeant in the jaw, knocking him backwards and causing him to hit his head on the ground.

The sergeant was unconscious for a short period and was treated by colleagues at the scene before paramedics arrived.

He had a cut on the back of his head and facial swelling and was taken to Liverpool Hospital in a stable condition.

As the alleged offender was arrested, police say a probationary constable was pushed.

The 23-year-old was taken to Fairfield Police Station and charged with a series of offences, including assaulting a police officer causing actual bodily harm, affray and two counts of resisting police.

The Chester Hill man has been refused bail and is scheduled to appear at Liverpool Local Court tomorrow.

This content first appear on 9news

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