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Sivert Heltne Nilsen (born 2 October 1991) is a Norwegian footballer who plays as a midfielder for Scottish Premiership club Aberdeen. He has previously played for IL Hødd, Vålerenga Fotball, SK Brann, AC Horsens, IF Elfsborg and Waasland-Beveren and has represented his country at youth level. He is the son of former Hødd and Brann manager Lars Arne Nilsen.