In this particular context of his leaving I doubt this will be the first thing on the club’s mind. And no, it does not have that much importance in European football or football in general. The numbers are very closely linked, synonymous really with the position of the player (striker 9, creative/offensive midfielder 10, winger 7 support striker 11, etc) much more than with the actual player himself.
I remember being a teenager in the 90s and being called upon to read out loud one of the sections with the most n-words. The first couple I tried to self-edit by saying the n-word, rather than the word itself. She, a white lady to a white student in a class full of people of color, wanted to force me to use the word. I refused and was asked to leave. I got detention for “back talking”.
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