Here's what you need to know about the significance of squad numbers, from numbers slated for defenders to the more attention-grabbing number seven
Football squad numbers are implemented in order to classify each player's role from one another, with each number signifying a unique role or responsibility for the player.
For example, lower-ranked numbers traditionally are reserved for centre-backs, while the likes of higher numbers in seven, nine and 10 are dedicated for the star playmakers, attacking midfielders and prized forwards.
Of course, modern football has moved away from traditional numbering, with some of the game's most memorable and iconic players adopting more unconventional and unorthodox numbering customs.