The match will take place on either August 23, 29 or 30, with full match details to be determined in the coming days.
Both Victory and United defeated A-League opposition in the Round of 32, and it will be the first time the sides meet in the FFA Cup.
Westfield FFA Cup – Round of 16 fixtures
Adelaide United v Melbourne Victory
South Melbourne v Sorrento FC
Moreton Bay United v Gold Coast City
Sydney Utd 58 v Heidelberg United
Blacktown City v Apia Leichhardt
Bentleigh Greens v Western Sydney Wanderers
Hakoah Sydney v Melbourne City
Bankstown Berries v Sydney FC