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Antti Mikko Niemi (born 31 May 1972) is a Finnish former professional footballer who played as a goalkeeper. He is currently an assistant coach of Volos of the Super League Greece. Since 2010, he has also worked as the goalkeeping coach of Finland national team. He also worked as a goalkeeping coach at Brighton & Hove Albion during the 2014–15 season. Niemi spent time as a player in the Scottish Premier League (with Rangers, Heart of Midlothian) and the Premier League (with Southampton and Fulham), and in 2008 announced his retirement due to injury. However, in 2009 he returned to sign for Premier League club Portsmouth, although he did not make any appearances before leaving in 2010.