Haller was born on June 22, 1994 in Ris-Orangis, France. The Ivorian international previously played for FC Utrecht in the Eredivisie for two and a half years. He had joined Utrecht from the French side AJ Auxerre during the winter break of the 2014-2015 season.
The forward then played for Eintracht Frankfurt in Germany before moving to West Ham United, where he has played since the summer of 2019. Haller was still under contract with the English until mid-2024.
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