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Marcell Jansen is a player for Hamburger SV III. He is a former professional footballer who played as a left-back or left midfielder. Jansen began his career with Borussia Mönchengladbach before moving to Bayern Munich in 2007. He spent four seasons with Bayern, winning two Bundesliga titles and two DFB-Pokals. In 2011, he joined Hamburger SV, where he played for six seasons before retiring in 2018.