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Ísak Andri Sigurgeirsson (born 11 September 2003) is an Icelandic footballer who plays as a midfielder for Swedish club Norrköping.He made his debut for Stjarnan as a substitute against Fylkir in the 2020 season, aged 16. For the latter half of the 2021 season, Ísak was loaned to ÍBV in the second tier. After establishing himself with Stjarnan he was sold to Norrköping on 18 July 2023, signing a 3-year contract and making his Allsvenskan debut coming on as a substitute against IFK Göteborg on 7 August 2023