A man has been charged after allegedly stabbing a police officer in Sydney’s north-west last month.

Just before 9am on August 21 officers were on Culloden Road near Waterloo Road, Marsfield when they approached a man walking in the middle of the road.

When the officers tried to guide him off the road the 24-year-old man allegedly stabbed a male constable in the arm with a knife.

The officers used a taser to restrain him and the officer suffered non-life-threatening injuries.

The man has been charged with assaulting an officer in the execution of duty and has been refused bail.

He will face Burwood Local Court today.