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Isak currently plays for IFK Norrköping, which is an Allsvenskan club. IFK Norrköping is a Swedish professional football club based in Norrköping, Sweden. The club was founded in 1897 and has won the Swedish championship 13 times. Isak joined the club in 2016 and has made over 100 appearances for the club. He has also scored over 30 goals for the club.