The Russian born Andrei Arshavin wears number 21 jersey for Arsenal.
Phillip Lahm, captain of Bayern Munich also wears 21.
David Silva, ace of Manchester City also wears 21.
Brazilian Correia Adriano is number 21 of Barcelona
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Besides Andrea Pirlo, David Silva, for many caps for the Portuguese National team and now at Braga...Nuno Gomes and korean soccer player Park ji sung used to but changed to 7
Ryan Giggs (Manchester United), Neymar (Santos), Thiago Alcantara (FC Barcelona), Gareth Bale (Tottenham Hotspur), Hernan Crespo (AC Milan), Didier Drogba (Chelsea)