From: Brewer's Dictionary of Modern Phrase and Fable:
A competition in which entrants select imaginary teams of real football players in an actual league and score points according to the actual performance of the players selected. The concept arose in the United States in the 1980s using American football players, but it soon spread across the Atlantic to British soccer teams. The Daily Telegraph was the first national newspaper to publish a fantasy football league, and its first season, in 1993, attracted around 300,000 entries. The contest has since been extended to other sports, such as cricket and basketball.
Room, Adrian, and Ebenezer Cobham Brewer, editors. “Fantasy Football.” Brewer's Dictionary of Modern Phrase and Fable, 2nd ed., Cassell, 2009. Credo Reference. Accessed 19 Sept. 2023.