Previously, there had been several isolated experiments in numbering shirts. At the start of 1928/29, Arsenal and Chelsea wore the numbers one through to 11 for a game each (against Sheffield Wednesday and Swansea Town respectively).
In the 1933 FA Cup Final between Everton and Manchester City, the players were numbered between one and 22, and a week later, having lifted the trophy, Everton also wore shirts numbered one to 11 against Wolverhampton Wanderers.
Then, in 1938, the FA decided to number players’ shirts (other than the goalkeepers’ kits) in the FA Cup Final and Semi-Final stages, as well international matches, international trials, and the Charity (now Community) Shield.
Squad numbers were introduced by the Premier League in 1993/94, which was its second season. They had been used for the first time in both the FA Cup Final and League Cup Final the previous season.
Leicester City first used squad numbers in the 1994/95 season. This was for their single season in the Premier League under Brian Little and then Mark McGhee and followed their Play-Off Final victory over Derby County in 1994.
They were relegated at the end of the season and the team did not have squad numbers the following season in the second tier. That campaign ended in Martin O’Neill’s side returning to the Premier League after their victory over Crystal Palace in the 1996 Play-Off Final at Wembley.
City therefore resumed wearing squad numbers throughout their Premier League years between 1996 and 2002. By the time they returned to the Championship in 2002 and again in 2004, squad numbers were now being used in that division also.
This season is therefore the 23rd year that Leicester City players have been awarded squad numbers. In 2007/08, when 40 players featured in the Club's first team, high numbers like 37 (Andy King), 38 (Steve Howard) and 39 (Ashley Chambers) appeared.
There was no No.40 as two players used the number 20 shirt (Mark de Vries and Harry Worley). Other high squad numbers have included Harry Kane (37) in 2012/13 and Chris Wood (39) between 2012 and 2014.
Four Foxes players have had squad numbers of 40 or over. Andrej Kramarić wore the No.40 shirt for the remainder of the season following his transfer from Rijeka in January 2015.
Elsewhere, Greek international Nikos Dabizas wore the No.44 shirt in 2003/04 - as did Ryan Watson on his only appearance in the first team, a Capital One Cup tie against Shrewsbury Town in August 2014.
Jordan Stewart adorned a No.46 shirt in his single substitute appearance in 1999/2000 before taking over the No.23 shirt and then the number 11 shirt in subsequent seasons.
The highest number this time around has been taken by young defender Elliott Moore, who has been handed No.33.
You can see this season's Leicester City squad numbers by clicking HERE.