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Mitroglou began his professional career with Borussia Mönchengladbach, a German club based in Mönchengladbach, North Rhine-Westphalia. He joined the club's youth academy in 2007 and made his senior debut in 2009. During his time with Borussia Mönchengladbach, Mitroglou made 44 appearances and scored 16 goals. He left the club in 2014 to join Fulham in the English Premier League.