Police have issued a facefit image of man believed to have committed a sexual assault in Charnwood earlier this year.

Police allege the man sexually assaulted the victim in his vehicle (suspected to be a dark-coloured SUV) on Lhotsky Street in Charnwood at around midnight on March 27.

The man is described as being in his mid-late 20s with a slim build, brown hair and blue eyes. He also has a tattoo of a skull on the inside of one of his ankles.

Police can be assisted via the Crime Stoppers ACT website.