Bremen - Werder Bremen says it has signed United States striker Aron Johannsson from the Dutch club AZ Alkmaar.
The Bundesliga club says Johannsson signed a four-year contract.
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Werder's managing director, Thomas Eichlin, says Johannsson was the "absolutely preferred candidate" to fill the gap left by the departure of striker Franco di Santo for Schalke.
The 24-year-old Johannsson has Icelandic roots, and joined AZ two years ago from Aarhus in Denmark.
As a junior, he played for Iceland before deciding to represent the U.S., for which he has four goals in 17 senior appearances.