Police want to speak with a woman who helped an elderly man after he was pushed to the ground in the CBD.

The 84-year-old man suffered cuts and bruising after the altercation at Centre Place on Friday, February 3.

The man was walking down a small flight of stairs when another man accused him of hitting him with his walking stick.

He then pushed the 84-year-old, who fell to the ground.

A female witness took a photo of the alleged offender before helping the elderly man walk from the scene.

The woman and anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.