Unseen CCTV footage and images of a man who may be able to assist with police inquiries has been released.

Investigators are re-appealing for witnesses after two young men were stabbed on a tram in Footscray, an inner-west suburb of Melbourne on July 28.

Both men, aged in their 20s, were on a tram travelling north along Droop Street about 8.45pm when they were approached by another man.

Police release new vision of man who may be able to assist with their inquiries

Two men were stabbed on a tram in Footscray, Melbourne on July 2 and police believe this man may be able to help

The 26-year-old Maribyrnong man and a 20-year-old Footscray man were taken to hospital in a stable condition.

Detectives have released unseen CCTV footage and images of a man who may be able to assist with their inquiries.

'We need to solve this so it doesn't happen again,' Transit CIU Detective Senior Constable Mick Keane told 9 News.

'We haven't had relevant information to identify the person of interest.'

Investigators have released images and CCTV footage of the man in question

A 26-year-old Maribyrnong man and a 20-year-old Footscray man were taken to hospital in a stable condition

'From now we need help from the public to identify the male.'

Police say he is perceived to be of African appearance and was wearing a dark coloured overcoat, and a dark or black coloured beanie and scarf.

Officers believe after the stabbing the suspect discarded some of the items immediately and was last seen wearing a black singlet.

He is believed to have a tattoo on his upper left arm.

Anyone who recognises the man or with information is urged to contact Crime Stoppers on 1800 333 000.