Footage has been released of a man wanted over a brazen sexual assault on a Melbourne tram last month.

Footage has been released of a man wanted over a brazen sexual assault on a Melbourne tram.

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— 3AW Melbourne (@3AW693) May 11, 2020

The alleged victim, 20, has told police a man sat next to her and started a conversation as their tram travelled between Preston and Bundoora about 4pm on April 9.

But the conversation turned sinister when then man exposed himself and performed a lewd act.

The woman shouted and approached the tram driver before the man left the tram at Plenty Road in Bundoora.

Investigators have released an image (above) of a man they believe may be able to assist with their enquiries.

He is perceived to be Caucasian, with dark brown hair and a beard, medium build, approximately 175cm tall and aged 20-25 years old.

He was wearing a dark long sleeve top, pink shorts, a light-coloured baseball cap and black and white shoes.

Investigators are appealing to anyone who might have been on the tram, or who recognises the man, to come forward and speak with them.