The greatest football teams of all time are discussed in almost mythical terms, with the names of their stars being passed from generation to generation.
While Liverpool supporters to this day grow up hearing of the exploits of Kenny Dalglish and Kevin Keegan, the same applies the world over. At Santos in Brazil, for instance, Pele's hold on the identity of the club remains strong to this day.
There will no doubt be great sides that have not made this list, it is not supposed to be comprehensive. The Busby Babes, Cruyff's Barcelona and Eusebio's Benfica are among those not included.
However, our 15 great teams of the past come from 14 different clubs, and an array of countries from both Europe and South America.
So,let's take a look at some of football's greatest sides and the stars who made them so special.