Karl Hein was the Estonian goalkeeper who left Arsenal for Werder Bremen in the 2026 summer window.
Hein joined Arsenal as a teenager after developing in Estonia and quickly became one of the country’s most promising goalkeepers. His route to regular senior football included loan experience, allowing him to play competitive matches rather than remain solely a reserve at the London club.
Werder Bremen first brought Hein into its squad on loan from Arsenal for the 2025–26 season. The German club later exercised its purchase option, turning the arrangement into a permanent transfer ahead of the 2026–27 campaign. Werder identified him as its new number one after another goalkeeper’s departure.
The question’s wording can cause confusion because Hein’s association with Werder began during the loan spell, before the permanent transfer was completed. He is also distinct from Estonia’s other football figures listed as distractors, including Sergei Zenjov, Marko Meerits and Matvei Igonen.