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Per Mertesacker was born in 1984 in Hannover, West Germany. He started playing football at the age of six and made his professional debut with Hannover 96 in 2003. Mertesacker joined Arsenal in 2011 and went on to make over 200 appearances for the club, winning three FA Cups. He retired from playing in 2018 and currently serves as the academy manager for Arsenal.