The merger of Manly-North Shore United and Warringah Freshwater created the Manly Warringah Dolphins at the close of the 1991 NSW Division 1 season for the start of the upcoming NSW Super League season.
The merger of Manly-North Shore United and Warringah Freshwater led to the creation of the Manly Warringah Dolphins in the NSW Division 1 league, which began play in the following year's NSW Super League.