A MELBOURNE player is under investigation for an alleged sexual assault from an overseas trip during the off-season.

The Demons confirmed that they had passed on the complaint to the AFL's integrity unit as soon as they were made aware. The AFL would not offer any comment. 

"The Melbourne Football Club is aware of an allegation involving a player," the club's statement said.

"The club has referred the matter to the AFL Integrity Unit.

"The Melbourne Football Club will fully cooperate with the process and whilst this is undertaken, the club will make no further public comment in relation to the matter." 

Victoria Police confirmed that on October 2 it had "received a report about an alleged sexual offence that occurred in September this year".

The complainant has not engaged investigators further and has not yet made a formal statement, having also been told the investigation will primarily be run by authorities in the country of the alleged incident.  

"Victoria Police's priority is the victim’s safety and welfare. They are always in control of what happens next," the police said in a statement.

"The reality is that some victims come to us to have their story heard, but they may not want to go through the process of a court case. 

"We want victims to receive the assistance they deserve – whether that be from us or from support services."