Police have released CCTV footage of an assault that left a Melbourne crowd controller with head injuries, in hopes of identifying two men involved.

Investigators were told two men were refused re-entry into a Spencer Street bar about 1.45am on Thursday, 24 March.

View photos Police are hoping to identify two men after a crowd controller was assaulted outside a Spencer St bar in March. Picture: Police Victoria More

As a result, one of the men became aggressive and as he moved towards a crowd controller, the employee pushed him away.

The man then punched the venue staff member in the face, which sent him reeling backwards before knocking his head against a wall.

The two men then ran from the scene and were believed to have headed south down Spencer Street and then east along Flinders Street.





View photos Police have released CCTV and images of two men they wish to speak to - one pictured wearing a white shirt, the other in a blue jumper. Picture: Police Victoria More

One of the men is described as being in his early 20s, possibly of a German background, about 176cm tall with a slim build and at the time was wearing a blue cap, white t-shirt and jeans with a satchel bag.

The second man was wearing a blue jumper and jeans.

Anyone with information about the incident is urged to contact Crime Stoppers on 1800 333 000.