While it's been in use for a long period, the phrase was popularised during the 20th century by heavyweight boxing winner Muhammad Ali, who, in 1964, declared himself "the greatest" soon after defeating Sonny Liston. Beneath would be the 10 contenders during the race for the greatest football gamers ever​. https://raymondpqmkh.blogripley.com/40561267/what-is-goat-in-football-an-overview