It's the age-old argument: Who is the best player?
The most modern take on it involves only two players in all honesty, but in days gone by, it might have involved far more.
The "greatest ever" tag is generally awarded on favouritism, patriotism or a bias because of results against a favoured team. It's also at times something of a misnomer, given the disparity between different eras of the game.
But we can always compare players from the same time, the same game, the same decade.
Though the rules of football as we know it were devised in 1848, it wasn't until the 1920s when the game was recognisable as it is today, with several important rule changes, including goalkeepers not being allowed to handle outside the area and the 10-yard rule for players defending free kicks coming into effect.
As a result, no players from before that era have been considered for inclusion in this collection of greats.
Here are the greatest players, one from each decade, from the 1920s to now.