Squad numbers are regarded as important in football. They are indicators of positions and there are expectations of players who wear certain numbers.
Skilful playmakers such as Diego Maradona or Lionel Messi usually wear No. 10, and you had better fit that mould if you want to wear it.
At some clubs, numbers have come to be associated with particular players, such as the No. 7 at Manchester United, with Cristiano Ronaldo, Eric Cantona and, of course, David Beckham donning it.
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The No. 7 became something of a brand when Beckham wore it at Old Trafford (as it later did with Ronaldo), but he switched to the No.