Werder Bremen's sporting director, Peter Niemeyer, expressed his satisfaction with the signing. He said, "We are pleased to have found a replacement for Michael Zetterer so quickly. Karl Hein impressed in La Liga last season and has also shown his qualities in the Estonian national team."

Niemeyer believes that Hein will be a valuable addition to the team. "With him, we now have a complete group of high-quality goalkeepers," he said.