Police are investigating a sexual assault in Greenvale in late February.
Investigators have been told a 30-year-old female had exited a bus just before 8.30pm on 27 February and was followed by an unknown male.
He followed her into Candlebark Drive, approached her from behind and groped her.
The victim pushed him away and he ran off down Aitken Boulevard.
Investigators have released images of a male they believe may be able to assist with their enquiries.
Anyone who recognises this man or who may have witnessed this incident is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au