Man pleads not guilty to punching cop

A man accused of punching a police officer twice in the face after he was caught driving with an expired licence in Sydney has pleaded not guilty to the assault.

Police say Ausamah Alnimer was pulled over in Ashcroft in Sydney's southwest for a random breath test on December 27 and was soon discovered to be driving on an expired licence.

As officers tried to issue him with a notice, the 20-year-old allegedly tried to drive away.

When he was stopped at a nearby intersection, police say Alnimer became abusive, got out of his ute and pushed a senior constable before punching him twice in the face.

Alnimer pleaded not guilty to numerous charges, including assaulting the police officer and affray when he appeared at Liverpool Local Court on Wednesday.

He did, however, plead guilty to driving on an expired licence.

His bail was continued with his matter due to return to court in March.

Police say the senior constable was taken to Liverpool Hospital after the alleged attack, suffering injuries to his arm, shoulder and legs but was released shortly after.