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Kasımpaşa was the Turkish club where Isaksson played. The Swedish goalkeeper joined the Istanbul-based team in 2012 after a successful spell with PSV Eindhoven. Isaksson made a significant contribution to Kasımpaşa, helping them achieve a respectable mid-table finish in the Süper Lig. He remained with the club for two seasons before returning to Sweden to play for Djurgårdens IF.