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Haller joined Utrecht on loan from Eintracht Frankfurt in the 2015-16 season, seeking more regular playing time. Despite initial struggles due to injuries, Haller eventually found his footing and became a key player for Utrecht, showcasing his goal-scoring prowess and helping the team achieve a respectable mid-table finish in the Eredivisie. His successful loan spell at Utrecht ultimately paved the way for Haller's rise to prominence in European football.