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The 22-year-old, who featured for Switzerland at the World Cup, has penned a three-year deal at the Commerzbank-Arena.
Seferovic only joined Sociedad in July 2013, but his stay in La Liga proved an unhappy one as he scored just twice in 24 top-flight appearances, although he started just nine of those matches.
"We are delighted that [Seferovic's] move was in our favour," he told the club's official website.
"We chose a young player who has a lot of experience."
