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A police officer stabbed in a daylight attack in Sydney’s city center displayed “enormous courage” in chasing after his assailant in spite of his injuries, the NSW premier says.

Elvis Poa, 35, remains in a stable condition in hospital after being stabbed near Hyde Park early on Sunday afternoon.

He and another officer were performing traffic duties just after 1pm on the corner of Castlereagh and Park streets when they were approached by the 35-year-old alleged attacker.

The man allegedly produced a 30cm long “kitchen-style” knife and stabbed Constable Poa in the back of the head two to three times.

Elvis Poa has been hailed for his bravery. Source: AAP/Nine

He fled and was pursued by the injured officer and a female constable along Park St and into Hyde Park, where officers directed him to drop the knife.

Other officers arrived and the man was tasered before being taken into custody, police said.

“The officer involved showed enormous courage,” Premier Chris Minns told reporters.

“To not only be the victim of an alleged assault, but also to apprehend the person who is alleged to have committed the offense.”